Compare the K Would these sulfides precipitate under the conditions given above? Explain. 2. calculated above with those of tin(II) sulfide and the α form of nickel (II) sulfide. Nitric acid oxidizes sulfide ion to sulfur. Explain on the basis of net ionic equilibrium equations and LeChatelier's principle why CuS dissolves more readily in HNO, than in HCI. 3. means of appropriate calculations, determine whether the nickel precipitate obtained at pH 8 was Ni(OH)2 or NiS 4. By Explain in terms of Le Chatelier's principle why ammonium ion must be added to an ammonia solution in order to prevent the precipitation of Mg(OH)2 along with the carbonates of the group IV cations. 5. List at least two advantages of using ammonium salts as reagents in various steps of the qualitative analysis scheme rather than the more readily available sodium salts. 6. Compare the K Would these sulfides precipitate under the conditions given above? Explain. 2. calculated above with those of tin(II) sulfide and the α form of nickel (II) sulfide. Nitric acid oxidizes sulfide ion to sulfur. Explain on the basis of net ionic equilibrium equations and LeChatelier's principle why CuS dissolves more readily in HNO, than in HCI. 3. means of appropriate calculations, determine whether the nickel precipitate obtained at pH 8 was Ni(OH)2 or NiS 4. By Explain in terms of Le Chatelier's principle why ammonium ion must be added to an ammonia solution in order to prevent the precipitation of Mg(OH)2 along with the carbonates of the group IV cations. 5. List at least two advantages of using ammonium salts as reagents in various steps of the qualitative analysis scheme rather than the more readily available sodium salts. 6.