Why is it that when zinc granules are dropped into the solution it turns grey and after it is removed and pressed, it turns back to silver and hard?
Answer:
Zinc granules will displace the tin from SnCl2 hence forming ZnCl2 which will dissolve leaving tin as a precipitate,which is grey in colour.now if you remove the tin from the solution and press it,it will form a piece of metallic tin which appears silver in colour.
When u add Zn granules to stannous chloride solution a redox reaction takes place.The redox potential for the Zn ion to Zn is more negetive than the the redox potential of Sn2+ toSn and hence the overall potential is positive and hence Zn reduces stannous ion to metallic tin.
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