(Answered) When concentrated hydrochloric acid is added to a solution

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When concentrated hydrochloric acid is added to a solution containing Cu2+(aq), the colour changes to a pale yellow-green.No gas is evolved. No such colour change occurs when concentrated sulfuric acid is added toCu2+(aq). Dilution ofthe yellow-green solution with water produces the original pale blue colour. Suggest an explanation of these observations.

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