If we overheat Basic Copper Sulphate(WSDTY), it will undergo one more color change. White copper sulfate will darken, which is no surprise at all. What we will see is the beginning of copper sulfate thermal (i.e. caused by heating) decomposition: 2CuSO4 → 2CuO + 2SO2↑ + O2↑. The reaction results in the formation of black copper oxide CuO.
There is a rule of thumb in chemistry: if a solid substance has in its composition atoms capable of forming gaseous products, then most probably upon heat this compound will decompose with release of these gases. For example, in copper sulfate composition, sulfur S and oxygen O atoms may form gaseous products: sulfur oxide SO2 and molecular oxygen O2. Now, look at the equation of copper sulfate thermal decomposition:2CuSO4 → 2CuO + 2SO2↑ + O2↑
Indeed, under excessive heat, copper sulfate releases exactly these gases.
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