Write the balanced chemical equation, including the physical states, for the reaction that occurs when the test solution reacts with excess sodium sulfide, Na2S. The test solution contains ammonia and zinc sulfate. The test solution reacts with excess sodium sulfate to give a visibly different result. The colorless test solution contains zinc sulfate and ammonia. In this reaction, the zinc sulfate in the test solution exists as a zinc ion, reacting with the excess sodium sulfide, which exists as a sulfide ion, to produce a visibly different product. Start by writing the reactants and products, as well as their physical states.