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CuCl2(s) = Cu^2_(aq) + + 2Cl^-(aq)

In solution the chloride anions )Cl^-) are colourless ; see also dissolved common salt (NaCl)

So it must be the copper cations (Cu^2+) that gives the colour blue.

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lenpollock

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Q: Which ion is responsible for the colour that is observed in the CuCl2 solution?
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