Question

Why the blue color of copper sulphate changes to white when sulphuric acid is added?

Answer 1

Explanation:

Sulphuric acid is a dehydrating agent. It will remove all the water molecule attached to CuSO4 through coordinate covalent bond and change the colour from blue to white. Answer: blue copper sulphte is hydrated CuSO4.5H2O, when copper sulphate is added to conc.

Answer 2

The blue colour sulphate changes to white when sulphuric acid is added upon dehydration.

Explanation:

• The blue colour of copper sulphate is due to the presence of hydrated water while sulphuric acid is a dehydrating agent.
• Hence the later is added to the former it removes all water molecules that remain attached to copper sulphate by forming coordinate covalent bonds thus changing colour from blue to white.
• In brief, due to loss of water of crystallization, change of colour of the same upon the addition of sulphuric acid takes place. This process can also be termed as a result of the transition of hydrous to an anhydrous state of the copper sulphate.

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