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Why does CuCO3 plus HCl turn green?

Updated: 9/21/2023
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11y ago

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Cu(CO3) + 2HCl --> CuCl2 + H2O + CO2

CuCl2 product, when dry is a yellow/brown powder. However, when wet it forms a co-ordination complex with the water in the solution:

CuCl2.2H2O --> Cu(Cl)2(H2O)2

The electronic structure of transition metals and ligands cause visible colours. In this case the solution is blue/green in colour.

If you dry the solution down you will get a blue/green powder.

Drying further in a dessicator will give the yellow/brown anhydrous CuCl2.

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11y ago
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Q: Why does CuCO3 plus HCl turn green?
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