Kamal heated from copper sulphate in a boiling tube and noted the water droplets along the walls of cube and the colour of crystal changed from blue to white give reason
Answers
Explanation:
you need to know that copper sulphate is deliquiscent substance (that means it absorb moisture from atmosphere) and also it contains is own hydrated water molecules which are 5 in number.
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CUSO4.5H2O----------- Hydrated Copper sulphate.
(DEGREE OF HYDRATION:-05.)
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Generally hydrated copper sulphate solution is blue in colour due to presence of water molecules,that scatter all blue colour to surroundings.
but after heating it looses all its water molecules then as it doesn't contain water molecules it scatters all light rays to outside that looks like white.
FROM THIS YOU CAN UNDERSTAND THAT WATER MOLECULES PRESENT IN THEM MAKES THEM APPEARED IN BLUE COLOURED.
HOPE YOU UNDERSTAND THIS. (mark me brainliest).
Reason:
The colour of the crystals changed from blue to white on heating due to removal of the water of crystallization. It is the fixed number of water molecules present in one formula unit of a salt. In this case, the water of crystallization present in Copper Sulphate evaporates due to heating, leaving behind dry(anhydrous) CuSO4.
CuSO4.5H2O(s) → CuSO4(s) + 5H2O
(Hydrous (Anhydrous
Copper Sulphate, Copper Sulphate,
blue) white)