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Question

Hot concentrated ___ must be added to aluminium hydroxide to obtain potassium aluminate.

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Solution

Aluminium hydroxide reacts with hot concentrated alkalis to form salt and water. Here, aluminium hydroxide reacts with hot concentrated potassium hydroxide to give potassium aluminate (KAlO2) and water, as shown below:

Al(OH)3+KOH(hot conc.)KAlO2+2H2O


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