You can use ammonia solution instead of sodium hydroxide solution, but there are different results for aluminium and copper(II) salts when you use excess ammonia. Nickel chloride, N i C l X 2 ( a q), is a yellow solution. One question is Nickel sulfate, N i S O X 4 ( a q) is a green solution. Solutions containing copper(II) ions form a blue precipitate when mixed with sodium hydroxide solution. 13 My daughter has a chemistry test that I am helping her prepare for. ![]() Solutions containing copper(II) ions form a blue precipitate when mixed with sodium hydroxide solution The deep blue color of the complex ion fades out.
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