![]() ![]() ![]() ![]() A yellow precipitate of PbI2 is formed because the attraction of lead ions to iodide ions is stronger than the attraction of lead ions to water and iodide ions to water. When the two colourless solutions of potassium iodide and lead nitrate are mixed together a yellow precipitate of PbI2 is formed and the K+ and NO3- ions remain in the solution as spectator ions. Potassium sulfate and lead nitrate Pb2+(aq) + SO4 2-(aq) -> PbSO4(s) Potassium iodide and lead nitrate Pb2+(aq) + 2I-(aq) -> PbI2(s)īeaker 1 The ions present in the solution before they are mixed are K+, I-, Pb2+, NO3. This settles at the bottom of the test tubes, so they both precipitation reactions. In test tube A, when the colourless solution of potassium sulfate and the colourless solution of lead nitrate is mixed together a white insoluble precipitate of Lead sulfate is formed because the attraction of lead ions to sulfate ions is stronger than the attraction of lead ions to water and sulfate ions to water, and potassium ions and nitrate ions remain in the solution as spectator ions - In test tube B, when the colourless solution of potassium iodide is mixed with the colourless solution of lead nitrate a yellow insoluble precipitate of Lead iodide is formed because the attraction of lead ions to iodide ions is stronger than the attraction of lead ions to water and iodide ions to water, and the potassium ions and lead ions remain in the solution as spectator ions - In test tube A and B a precipitation is occurring because when two solutions are mixed together an insoluble solid is formed, which is a precipitate. ![]()
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