Treat White Chalk with Copper Acetate to Get it

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asked Apr 26, 2019 in 3D Segmentation by weishida (1,780 points)

Copper Acetate Manufacturers(WSDTY) proposed the easiest one is calcium acetate Ca(CH3COO)2. I have obtained it by treating white chalk (almost pure calcium carbonate) with acetic acid. In this reaction, large amount of CO2 gas is released, so don't put all chalk at once, or the foam will spill from the flask. The equation of this reaction is: CaCO3 + 2CH3COOH → Ca(CH3COO)2 + H2O + CO2

Copper II acetate Cu(CH3COO)2 is a bit harder to make. I've made it electrochemically, by dissolving copper anode in acetic acid. An easier way would be the following 2-step reaction, starting from copper (II) sulphate (CuSO4, "blue vitriol").

First, dissolve some CuSO4 in water and add baking soda (NaHCO3). Sodium carbonate or hydroxide are fine too. Again, CO2 gas will release (beware of foam), and green-blue sediment of the basic copper (II) carbonate will form:

2CuSO4 + 2NaHCO3 → CuCO3·Cu(OH)2 + Na2SO4 + CO2

Let the sediment to precipitate, remove excess of the liquid, then dissolve the sediment it in the acetic acid:

CuCO3·Cu(OH)2 + 4CH3COOH → 2Cu(CH3COO)2 + 2H2O + CO2. You will obtain blue solution of the copper (II) acetate. Again, carbon dioxide gas would form, so don't add a lot of acid at once.

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