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Copper sulphate reaction. Solution of copper sulphate (CuSO4) before (left) and after (right) the addition of concentrated hydrochloric acid. At left the copper II ions (Cu2-) in copper sulphate solution give the blue colour. Addition of hydrochloric acid leads to the formation of tetrachlorocuprate II complex ions ((CuCl4)2-) and their yellow colour mixed with the blue of the copper ions produces the green solution.
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TOP10164035
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達志影像
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RM
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