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why does copper sulfate solution lose its blue colour when reacted with zinc powder?
o and in the experiment an excess of zinc powder was used why? im a yr 11 physics student by the way so try to keep it simple
According to Arrhenius,''the colour of an electrolytic solution is the characteristic of its ions present in that solution.''
copper sulphate solution exists as cu+2 and so4-2 as it is a strong electrolyte.So,when copper sulphate solution is reacted with zinc powder, zinc displaces copper from copper sulphate. As a result zinc sulphate is formed.
In this way, cu+2 disappears from the solution forming cu metal, zinc metal changes to zn+2 but zn+2 ion does not have characteristic colour.
Hence, copper sulphate solution lose its blue colour when reacted with zinc powder.
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