Calcium Ca2+ solution - white precipitate when reacted with sodium hydroxide, Copper Cu2+ solution - blue precipitate when reacted with sodium hydroxide, Iron (II) Fe2+ solution - grey-green precipitate when reacted with sodium hydroxide, Iron (III) Fe3+ solution - fox-brown precipitate when reacted with sodium hydroxide solution, Lead Pb2+ solution - yellow precipitate when reacted with potassium iodide,

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