Two important uses of precipitation reactions are to isolate metals that have been extracted from their ores and to recover precious metals for recycling. (b) What is the net ionic equation? A) allows us to identify an endergonic reaction. If 4.65 moles of propane, C3H8, are C) The rate at which the forward and reverse reactions are proceeding are equal. II. P4(s) + 10 Cl2(g) --> 4 PCl5(s) + 452 kcal -55.2 kcal. I. 2 CO(g) + O2(g) CO2(g) + 135.2 kcal Crystals grow from a sugar solution. 2 NO + O2 --> 2 NO2 This precipitate is probably, All of the statements regarding redox reactions are true except. of barium acetate. Iron Ill Hydroxide + Hydrobromic Acid 11. The number of grams in 2.65 mol of SO2 is. The number of grams in 7.00 moles of N2 is. . A) precipitation 2 AgNO3(aq) + K2SO4(aq) 2 KNO3(aq) + Ag2SO4(s) Reaction rates are determined by all of the following factors except the. acetate is. The oxidation number of chlorine in the compound FeCl3 is, All of the reactions shown are oxidation-reduction reactions except. Precipitation reactions are a subclass of exchange reactions that occur between ionic compounds when one of the products is insoluble. In the sections that follow, we discuss three of the most important kinds of reactions that occur in aqueous solutions: precipitation reactions (also known as exchange reactions), acidbase reactions, and oxidationreduction reactions. Given: reactants. B) a reducing agent causes another substance to be reduced. Part 3 FeedbackWrite the balanced net ionic equation, including states ofmatter, for the overall reaction.2Cr(OH)3(aq)+3NO'3(aq)+4OH'(aq)2CrO2'4(aq)+3NO'2(aq)+5H2O(l) . 2 moles C4H10, What does the balanced equation given below mean? B) enthalpy and entropy are of equal importance in determining the spontaneity of a reaction. In a reaction to produce ammonia, the theoretical yield is 420.g. . If we look at net ionic equations, it becomes apparent that many different combinations of reactants can result in the same net chemical reaction. III. Solution: . Lowering the temperature How many molecules are present in 3.25 mol of C2H6O? In a chemical reaction, the quantity of each element does not change. . 452 kcal + 4 PCl5(s) P4(s) + 10 Cl2(g) Thus Pb(C2H3O2)2 will dissolve, and PbI2 will precipitate. Posted on . When the reaction shown is correctly balanced, the coefficients are: C3H8. 4.2: Precipitation Reactions is shared under a CC BY-NC-SA 3.0 license and was authored, remixed, and/or curated by LibreTexts. Solid potassium phosphate is added to an aqueous solution of mercury(II) perchlorate. The left hand side has 4 P's and the right hand side . Copper(II) sulfate + sodium phosphate Observations fiend blue Molecular equation CuSO4 + NA POU Complete ionic equation 4. 31) A process which is unfavorable with respect to enthalpy, but favorable with respect to entropy E) refers to the free energy of the reaction. Aqueous solutions of barium chloride and lithium sulfate are mixed. . All salts of Group IA, and ammonium are soluble. See Answer. Solid lead(II) acetate is added to an aqueous solution of ammonium iodide. Most barium compounds are very poisonous; however, barium sulfate is often administered internally as an aid in the X-ray examination of the lower intestinal tract (). 2 Al(OH)3(aq) + 3 H2SO4(aq) Al2(SO4)3(s) + 6 H2O(l) ________ C5H12 + ________ O2 ________ CO2 + ________ H2O. Since there are 7 oxygen atoms on the right and only 3 on the left, a 3 is placed before O2, to produce the balanced equation: In reactions involving many compounds, equations can be balanced using an algebraic method, based on solving a set of linear equations. hen 1 mol P4(s) is produced, 304.0 kcal are consumed. Label each compound (reactant or product) in the equation with a variable to represent the unknown coefficients. Transcribed image text: The balanced equation for the reaction between aqueous ammonium sulfate and aqueous barium acetate is: you will recevie a zero if incorrect polyatomic ions are used Show Rubric. Information about the equation, such as the type of reaction may also be calculated. 105 g of MgCl2 contains ________ mol MgCl2. Give the complete chemical equation, ionic, and net ionic equation for the following. Calcium hydroxide + Hydrogen phosphate 4. Bruce Edward Bursten, Catherine J. Murphy, H. Eugene Lemay, Matthew E. Stoltzfus, Patrick Woodward, Theodore E. Brown, Sedimentary and Metamorphic Rock Lecture Exam. Phosphoric Acid + Magnesium H 7. No, it does not. In a typical oxidation-reduction reaction the electrons are transferred. Barium Iodide + Sodium Sulfate 3. heat 4. gas in the following equation? How many moles of NaHCO3 are present in a 2.00 g sample? Balanced Equation: Net Ionic Equation: 4. iron (III) sulfate and barium iodide. 2 moles AlCl3, In the reaction shown, what is the mole ratio that would be used to determine the number of moles Ammonium sulfate react with barium chloride (NH 4) 2 SO 4 + BaCl 2 BaSO 4 + 2NH 4 Cl [ Check the balance ] Ammonium sulfate react with barium chloride to . and chromate/dichromate compounds such as Sodiumdichromate compounds such as Sodium Direct substitution is usually the simplest way. To identify a precipitation reaction and predict solubilities. The answer will appear below; Always use the upper case for the first character in the element name and the lower case for the second character. Barium acetate | C4H6BaO4 | CID 10980 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological activities . This is the overall balanced chemical equation for the reaction, showing the reactants and products in their undissociated form. The left hand side has 4 P's and the right hand side has 4 P's. C) gaining electrons. 8/31/2015. Accessibility StatementFor more information contact us atinfo@libretexts.orgor check out our status page at https://status.libretexts.org. we nd that when an aqueous solution of barium chloride (BaCl 2 ) is added to an aqueous solution of sodium sulfate (Na 2 SO 4 ), a white precipitate is formed (Figure . ________ Al(OH)3 + ________ H2SO4 ________ Al2(SO4)3 + ________ H2O. The balanced equation for the reaction between aqueous ammonium sulfate and aqueous barium acetate is . Use uppercase for the first character in the element and lowercase for the second character. 8/31/2015. (d) -hc, where h is Planck's constant. Calculate the % yield of the reaction. 7/29/2015. Use uppercase for the first character in the element and lowercase for the second character. reaction? How many grams of C will be consumed when 5.00 grams of Na2SO4 react according to the balanced The molecular weight of PCl3 is ________ amu. Which reaction is not an example of a redox reaction? Copy Table into your notebook and use Ohm's equation to fill in the blanks. Instead, you must begin by identifying the various reactions that could occur and then assessing which is the most probable (or least improbable) outcome. As you will see in the following sections, none of these species reacts with any of the others. B) from what is being oxidized to the substance being reduced. )%2F04%253A_Reactions_in_Aqueous_Solution%2F4.02%253A_Precipitation_Reactions, \( \newcommand{\vecs}[1]{\overset { \scriptstyle \rightharpoonup} {\mathbf{#1}}}\) \( \newcommand{\vecd}[1]{\overset{-\!-\!\rightharpoonup}{\vphantom{a}\smash{#1}}} \)\(\newcommand{\id}{\mathrm{id}}\) \( \newcommand{\Span}{\mathrm{span}}\) \( \newcommand{\kernel}{\mathrm{null}\,}\) \( \newcommand{\range}{\mathrm{range}\,}\) \( \newcommand{\RealPart}{\mathrm{Re}}\) \( \newcommand{\ImaginaryPart}{\mathrm{Im}}\) \( \newcommand{\Argument}{\mathrm{Arg}}\) \( \newcommand{\norm}[1]{\| #1 \|}\) \( \newcommand{\inner}[2]{\langle #1, #2 \rangle}\) \( \newcommand{\Span}{\mathrm{span}}\) \(\newcommand{\id}{\mathrm{id}}\) \( \newcommand{\Span}{\mathrm{span}}\) \( \newcommand{\kernel}{\mathrm{null}\,}\) \( \newcommand{\range}{\mathrm{range}\,}\) \( \newcommand{\RealPart}{\mathrm{Re}}\) \( \newcommand{\ImaginaryPart}{\mathrm{Im}}\) \( \newcommand{\Argument}{\mathrm{Arg}}\) \( \newcommand{\norm}[1]{\| #1 \|}\) \( \newcommand{\inner}[2]{\langle #1, #2 \rangle}\) \( \newcommand{\Span}{\mathrm{span}}\)\(\newcommand{\AA}{\unicode[.8,0]{x212B}}\), Example \(\PageIndex{1}\): Balancing Precipitation Equations, Exercise \(\PageIndex{1}\): Mixing Silver Fluoride with Sodium Phosphate, 4.1: General Properties of Aqueous Solutions, Determining the Products for Precipitation Reactions, YouTube(opens in new window), Predicting the Solubility of Ionic Compounds, YouTube(opens in new window), status page at https://status.libretexts.org, most salts that contain an alkali metal (Li, most salts of anions derived from monocarboxylic acids (e.g., CH, silver acetate and salts of long-chain carboxylates, salts of metal ions located on the lower right side of the periodic table (e.g., Cu, most salts that contain the hydroxide (OH, salts of the alkali metals (group 1), the heavier alkaline earths (Ca. Which statement best describes the way a catalyst works? _____________________ ________, and the entropy of the system ________. Question: State a general equation for a neutralization reaction. 2 Fe + 3F2 --> 2 FeF3, The Haber process is used to make ammonia, which is an important source of nitrogen that can be In the correctly balanced reaction, the coefficient for H2O is: 4.ammonium carbonate and potassium chromate. Ca(OH)2(aq)+2HNO3(aq)Ca(NO3)2(aq)+2H2O(l), Ca+(aq)+2OH(aq)+2H+(aq)+2NO3(aq)Ca+(aq)+2NO3(aq)+2H2O(l), Ba(CH3COO)2(aq)+FeSO4(aq)Fe(CH3COO)2(aq)+BaSO4(s), Ba+(aq)+2CH3COO(aq)+Fe2+(aq)+SO42(aq)Fe+2(aq)+2CH3COO(aq)+BaSO4(s), ZnCO3(s)+H2SO4(aq)ZnSO4(aq)+CO2(g)+H2O(l), ZnCO3(s)+2H+(aq)+SO42(aq)Zn2+(aq)+SO42(aq)+CO2(g)+H2O(l), Cu+2(aq)+2NO3(aq)+2H+(aq)+S2(aq)CuS(s)+2H+(aq)+2NO3(aq), Mg(OH)2(s)+2HClO3(aq)Mg(ClO3)2(aq)+2H2O(l), Mg(OH)2(s)+2H+(aq)+2ClO3(aq)Mg+2(aq)+2ClO3(aq)+2H2O(l), 3KCl(aq)+(NH4)3PO4(aq)K3PO4(aq)+3NH4Cl(aq). ________ KClO3 ________ KCl + ________ O2, When the reaction shown is correctly balanced, the coefficients are: You'll get a detailed solution from a subject matter expert that helps you learn core concepts. There is now one Barium, one Sulfate, two hydroxides, and two oxygens on either side of the arrow. Oxidizing agent - Wikipedia. Sodium + Water -Z 9. The combination of ions least likely to produce a precipitate is. For example, C6H5C2H5 + O2 = C6H5OH + CO2 + H2O will not be balanced, but XC2H5 + O2 = XOH + CO2 + H2O will. The balanced equation for the reaction between aqueous ammonium sulfate and aqueous barium acetate is (NH4)2SO4 (aq) + Ba(C2H302)2 (aq) - Baso, (aq) + 2 NH.C2H2O2 (s). Everything you need for your studies in one place. The balanced equations are produced by the given reactions. 4/7/2015. B) having a small value of activation energy. NH4)2SO4(aq) + Ba(C2H3O2)2(aq) BaSO4(s) + 2 NH4C2H3O2(aq). E) the speed of a reaction is not influenced by its spontaneity. All of the statements regarding redox reactions are true except, when a substance is oxidized its charge (or oxidation number) decreases, In a precipitation reaction the insoluble product can be identified by the symbol, Consider the reaction shown and identify the statement that is not true. Ba+(aq)+2OH(aq)+2H+(aq)+2CN(aq)Ba+(aq)+2CN(aq)+2H2O(l), Give the oxidation number of bromine in the following. A compound is analyzed and found to contain 0.279 g C, 0.0469 g H, and 0.124 g O. When 1 mol P4(s) reacts, 435.2 kcal are released. In order to produce 5.65 moles E) H2SO4(aq) + Ca(OH)2(aq) CaSO4(aq) + 2 H2O(l), In a precipitation reaction the insoluble product can be identified by the symbol, Which one of the following substances is produced during an acid/base (or neutralization). If a precipitate forms, write the net ionic equation for the reaction. Now the equation reads: Notice that the 2 on the right hand side is "distributed" to both the Na2 and the O. II. So, for each element, count its atoms and let both sides be equal. The last column of the resulting matrix will contain solutions for each of the coefficients. Identify the ions present in solution and write the products of each possible exchange reaction. hydrogen on each side. C3H8 + 5 O2 --> 3 CO2 + 4 H2O+ 488 kcal. Iron Ill Sulfate + Calcium Nitrate ( 8. For charge to be conserved, the sum of the charges of the ions multiplied by their coefficients must be the same on both sides of the equation. Activation energy can best be described as the. Create an equation for each element (H, N, O, S, Ba, C) where each term represents the number of atoms of the element in each reactant or product. 2. The entropy change of this reaction is ________ and the enthalpy change is ________, so at a very Both tripotassium phosphate and ammonium chloride are soluble. In the following reaction which species is being oxidized and which is being reduced? Hence, there will be not net ionic equation. Which factors would decrease the rate of a reaction? Consider the reaction when aqueous solutions of lead(II) acetate and barium sulf; Write the balanced equation for the reaction that occurs between ammonium phosphate and iron(II) nitrate. What is the actual yield of the 4 NH3 + 5 O2 -> 4 NO + 6 H2O, Interpret in words the equation shown. This is still an unbalanced equation. monoxide? The coefficients represent both the basic unit and mole ratios in balanced equations. When aqueous solutions of silver nitrate and potassium dichromate are mixed, silver dichromate forms as a red solid. Fe(s) + CuCl2 aq) Cu(s) + FeCl2(aq), The balanced equation for the reaction occurring when calcium nitrate solution is mixed with Solid sodium fluoride is added to an aqueous solution of ammonium formate. A) A mole of a diatomic element contains 2 NA moles of atoms of the element. Chemistry: Molecular Nature Of Matter And Change, Iron reacts rapidly with chlorine gas to form a reddish brown, ionic compound (A), which contains iron in the higher of its two common oxidation states. hydrogen and magnesium chloride? B According to Table \(\PageIndex{1}\), ammonium acetate is soluble (rules 1 and 3), but PbI2 is insoluble (rule 4). 280.mL. Write the molecular, ionic and net ionic equations. Classify the following ionic compounds as soluble or insoluble: (a) silver sulfate (Ag 2 SO 4 ), (b) calcium carbonate (CaCO 3 ), (c) sodium phosphate (Na 3 PO 4 ). B) The molar mass of any compound is equal to its molecular weight in grams. difference in energy between reactants and the maximum energy. Replace immutable groups in compounds to avoid ambiguity. To fix this unbalanced equation a 5 in front of the O2 on the left hand side is added to make 10 O's on both sides resulting in. Because strontium sulfate is much less soluble in water than strontium chloride, sodium chloride, or sodium sulfate, this reaction is: Na2SO4 (aq) + SrCl2 (aq) => 2 NaCl (aq) + SrSO4 (s). Simple chemical equations can be balanced by inspection, that is, by trial and error. ________ HNO3 + ________ KOH ________ KNO3 + ________ H2O, Reduction is the process of B) a large enough number of collisions must occur. All salts of nitrates, chlorates and acetates are soluble. Which of the following statements can be assumed to be true about how reactions occur? Write the balanced equation, include states, for the reaction between solutions of: a) potassium hydroxide and lead(II) nitrate (Click for the solution to a) b) lead(II) nitrate and iron(II) sulfate c) ammonium sulfate and barium chloride d) copper(II) sulfate and sodium carbonate e) silver nitrate and sodium chloride E) both A and B, When the reaction shown is correctly balanced, the coefficients are: Which reaction is an example of both a precipitation and a neutralization? C3H8 + 5 O2 3 CO2 + 4 H2O + 488 kcal Home Reactions Blog. Balance the equations using symbols (g), (aq . Free and expert-verified textbook solutions. D) occur at high temperatures, but not at lower temperatures. Chemical reaction. Which of the following states of matter should have the lowest entropy value? The formation of which one of the compounds below will act as the driving force for an acid-base. N2(g) + 3 H2(g) ---> 2 NH3(g), The combustion of propane gas is used to fuel barbeque grills. Which factors would increase the rate of a chemical reaction? (II) sulfate, you look it up and find it to be soluble. The balanced equation for the reaction between aqueous ammonium sulfate and aqueous barium acetate is (NH4)2SO4 (aq) + Ba(C2H302)2 (aq) - Baso, (aq) + 2 NH.C2H2O2 (s). For the total ionic equations, write strong electrolytes in solution in the form of aqueous ions. Which reaction is an example of an acid-base reaction? Table \(\PageIndex{1}\) gives guidelines for predicting the solubility of a wide variety of ionic compounds. 11 BALANCING CHEMICAL EQUATIONS 1. Fe2S3 + 4 O2 2 FeO + 3 SO2, n the reaction shown, how many moles of HCl are needed to react with 2.4 moles of Al? Aqueous solutions of barium chloride and lithium sulfate are mixed. Because ionic substances such as \(\ce{AgNO3}\) and \(\ce{K2Cr2O7}\) are strong electrolytes (i.e., they dissociate completely in aqueous solution to form ions). The left hand side has 2 O's and the right hand side has 10 O's. Calculate the mass in grams of 5.65 1021 molecules of SO3. Subscripts may be changed to make an equation simpler to balance. Table \(\PageIndex{1}\) shows that LiCl is soluble in water (rules 1 and 4), but BaSO4 is not soluble in water (rule 5). sodium carbonate and iron ii chloride ionic equation. Identify the type of reaction. Consider the reaction shown: One mole of methane, CH4, contains the same number of atoms as one mole of carbon Count the number of atoms of each element on each side of the equation and verify that all elements and electrons (if there are charges/ions) are balanced. Removing products as they are formed The anion would only be chloride if the other four tests proved to be negative. Refer to Table \(\PageIndex{1}\) to determine which, if any, of the products is insoluble and will therefore form a precipitate. CH4 + 2 O2 --> CO2 + 2H2O, The Haber process is used to make ammonia, which is an important source of nitrogen that can be Asked for: overall, complete ionic, and net ionic equations. Hence, there will be not net ionic equation. The equation is now balanced because there is an equal amount of substances on the left and the right hand side of the equation. 2 Cr(s) + 3 Cl2(g) 2 CrCl3(s), The oxidation number of iron in the compound FeBr3 is, The combination of ions least likely to produce a precipitate is, When the reaction shown is balanced, there are ________ atoms of oxygen and ________ atoms of hydrogen on each side._______ (NH4)2SO4(aq) + _______ Ba(C2H3O2)2(aq) _______ BaSO4(s) + _______ NH4C2H3O2(aq), The scientific principle which is the basis for balancing chemical equations is, When a solution of iron(III) nitrate is mixed with a solution of sodium hydroxide, a rust colored precipitate forms. Based on the reaction shown, which statement is true? (NH4)2SO3 (aq) + Ba(C2H302)2 (aq) - BaSO3(aq) + NH.C2H3O2 (aq). If we wrote the balanced complete ionic equation, we would see this: To fix this a 2 is added in front of the Na2O on the right hand side. This equation is a balanced equation because there is an equal number of atoms of each element on the left and right hand sides of the equation. In order to determine if a reaction is at equilibrium which of the following must be true? B) One mole of solid tetraphosphorus decaoxide reacts with six moles of liquid water to produce D) combustion The answer is NR because the products are (1) soluble and (2) ionize 100%. Balance the equation (NH4)2SO4 + Ba(C2H3O2)2 = BaSO4 + NH4C2H3O2 using the algebraic method. When potassium hydroxide and hydrobromic acid are combined the products are, The scientific principle which is the basis for balancing chemical equations is. Which of the following processes involve an increase in entropy of the system? Which statement concerning the mole concept is not true? Strong heating decomposes compound A to compound B, another ionic compound, which contains iron in the lower of its two oxidation states. BaC2H3O22. 5. III. To balance a chemical equation, enter an equation of a chemical reaction and press the Balance button. All salts of sulfate are soluble except for barium sulfate, lead(II) sulfate, and strontium sulfate. D) occur at low temperatures but not at higher temperatures. There must be the same quantities of each atom on each side of the equation. You can also ask for help in our chat or forums. ________ Li + ________ Br2 ________ LiBr, In the reaction shown, ________ is the oxidizing agent because it ________. Nano-fertilizers (NFs) application may be a promising solution for combat these challenges. ________ C6H14(l) + ________ O2(g) ________ CO2(g) + ________ H2O(g), When the following reaction is balanced, the coefficient in front of carbon dioxide is: . C) a reaction which is nonspontaneous at low temperature cannot be spontaneous at higher 1. Aqueous solutions of calcium bromide and cesium carbonate are mixed. Which process is not likely to be considered reversible? For a chemical reaction to occur, all of the following must happen except. Use the calculator below to balance chemical equations and determine the type of reaction (instructions). Write balanced formula equations for these reactions and identi6r the type of reaction. It is a double replacement reaction. When 50.0 g of N2 react, ________ kcal will be ________. the balanced equation for ammonium hydroxide and perchloric acid is given below.NH4OH (aq) + HCl (aq) ---> NH4Cl (aq)+ H2O (l) .Above is the balanced molecular Equation. Hence, there will be not net ionic equation. A) halogens usually behave as oxidizing agents because they readily gain electrons. The total ionic equation can be written as by writing ionic compounds in the form of ions. When compound A is formed by the reaction of 50.6 g of Fe and 83.8 g of Cl. Q: Ferric nitrate is added to ammonium hidroxide. The function of a catalyst in a reaction system is to. N2 = 226 kcal/mol NH,SO4 (aq) + BaC2H302 (aq) -- BaSO4(s) + NH4C2H2O2 (aq). Acetic acid, #"CH"_3"COOH"#, will react with sodium hydroxide, #"NaOH"#, to produce sodium acetate, #"CH"_3"COONa"#, and water. Calculate the pH\mathrm{pH}pH of the solution at 25C25^{\circ} \mathrm{C}25C. Enter an equation of an ionic chemical equation and press the Balance button. Since there is an equal number of each element in the reactants and products of H8N2O4S + Ba(C2H3O2)2 = BaO4S + 2NH4C2H3O2, the equation is balanced. Balanced symbol equation . C) The molar mass of a diatomic element is its atomic weight in grams times two. Balance the equation Ba(C2H3O2)2 + Na2CrO4 = BaCrO4 + NaC2H3O2 using the algebraic method. Read our article on how to balance chemical equations or ask for help in our chat. this is our precipitate sulfide would not be insoluble if it contains a an alkali metal such as . Why is mA left out of the air-mass classification scheme? B) enthalpy and entropy are of equal importance in determining the spontaneity of a reaction. four moles of phosphoric acid solution. Based on the reaction shown, which statement is true? the rates of the reaction in the forward and reverse directions are exactly equal. If the reaction occurs, predict the products and write a balanced equation. \[\ce{3AgF(aq) + Na_3PO_4(aq) \rightarrow Ag_3PO_4(s) + 3NaF(aq) } \nonumber \], \[\ce{3Ag^+(aq) + 3F^{-}(aq) + 3Na^{+}(aq) + PO_4^{3-}(aq) \rightarrow Ag_3PO_4(s) + 3Na^{+}(aq) + 3F^{-}(aq) } \nonumber \], \[\ce{3Ag^{+}(aq) + PO_4^{3-}(aq) \rightarrow Ag_3PO_4(s)} \nonumber \]. Ammonium Sulfate + Barium Acetate = Barium Sulfate + Ammonium Acetate, (assuming all reactants and products are aqueous. O2 = 119 kcal/mol Students tend to think that this means they are supposed to just know what will happen when two substances are mixed. to form the chloride ion. The ions that are present in the same form on both sides of the reaction are known as Spectator ions. In analyzing data from a spectroscopic experiment, the inverse of each experimentally determined wavelength of the Balmer series is plotted versus 1/(ni2)1 / \left( n _ { i } ^ { 2 } \right)1/(ni2), where nin_ini is the initial energy level from which a transition to the n=2 level takes places. CaCO3(s) CaO(s) + CO2(g). Barium Peroxide BaSO4 Barium Sulfate BBr3 Boron Tribromide BCl3 Boron Trichloride BeCl2 Beryllium Chloride BeI2 . Since all ammonium salts are soluble in water, the only precipitate has to be zinc sulfide P4(s) + 10 Cl2(g) 4 PCl5(s) --> H = -435.2 kcal. . Determining the Products for Precipitation Reactions: Determining the Products for Precipitation Reactions, YouTube(opens in new window) [youtu.be]. The combination of ions most likely to produce a precipitate is. 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