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 ( $K A l O_{2}$ ) and water, as shown below:

$A l (O H)_{3} + K O H (h o t c o n c .)$ $\to$ $K A l O_{2} + 2 H_{2} O$

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

When hot concentrated potassium hydroxide is added to lead, potassium oxide is obtained as the major product and hydrogen gas is liberated in the process.

Q. Aluminium is prepared industrially by Hall-Heroult process. Various steps in the concentration of ore are given below . Write them in the correct order.
i. The precipitate formed is separated , washed and strongly heated to get alumina.
ii. Crushed bauxite is leached with hot sodium hydroxide solution.
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Q. Give equations for the following conversions:
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Aluminium oxide reacts with hot concentrated solution of sodium hydroxide to form:

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

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