We are asked to identify which ions remain after PbI2 precipitates in the given reaction:
2 KI(aq) + Pb(NO3)(aq) → 2 KNO3(aq) + PbI2(s)
We will refer to the solubility rules shown below:
•Soluble Ionic Compounds:
▪ Group 1A ions (Li+, Na+, K+, etc.) and Ammonium ion (NH4+) are soluble
▪ Nitrates (NO3-), Acetates (CH3COO- or C2H3O2-), and most Perchlorates (ClO4-) are soluble
▪ Cl-, Br-, and I- are soluble except when paired with Ag+, Pb2+, Cu+, Hg22+
▪ Sulfates (SO42-) are soluble except those of Ca2+, Sr2+, Ba2+, Ag+, and Pb2+
•Insoluble Ionic Compounds:
A precipitation reaction.
Which ions remain in solution after PbI2 precipitation is complete?
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