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Solutions of potassium iodide and lead nitrate are mixed. Which net ionic equation describes what happens?
AK+ and NO3- combine to give KNO3(s)
BPb2+ and 2I- combine to give PbI2(s)
CK+ and I- combine to give solid KI
DPb2+ and NO3- give Pb(NO3)2(s)
Answer & Solution
Correct answer: B. Pb2+ and 2I- combine to give PbI2(s)
1. The ions in the mixture are K+, I-, Pb2+ and NO3-.
2. Possible new pairings are KNO3 and PbI2.
3. Potassium salts are soluble and nitrates are soluble, so KNO3 stays in solution.
4. Lead iodide is one of the halide exceptions, so PbI2 comes down as a bright yellow solid.
5. Removing the spectator ions K+ and NO3- leaves Pb2+ plus 2I- giving PbI2(s).
_Source: OpenStax Chemistry (CC BY 4.0), Ch 4 "Stoichiometry of Chemical Reactions", section 4.2 Classifying Chemical Reactions_
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