sodium iodide and mercury(II) chloride
Adding very pale yellow sodium iodide to colorless mercury(II) chloride produces an orange precipitate.
Solution A: 0.5 M sodium iodide (very pale yellow)
Solution B: 0.1 M mercury(II) chloride (colorless)
Precipitate: (orange)
HgCl2(aq) + 2 NaI(aq) --> HgI2(s) + 2 NaCl(aq)
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