sodium iodide and lead(II) nitrate
Adding very pale yellow sodium iodide to colorless lead(II) nitrate produces a yellow precipitate.
Solution A: 0.5 M sodium iodide (very pale yellow)
Solution B: 0.2 M lead(II) nitrate (colorless)
Precipitate: (yellow)
Pb(NO3)2(aq) + 2 NaI(aq) --> PbI2(s) + 2 NaNO3(aq)
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