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JAMB Chemistry 2011 Paper

Question : 10

Total: 47

The importance of sodium aluminate (III) in the treatment of water is to

cause coagulation
neutralize acidity
prevent goitre and tooth decay
kill germs

Validate

Solution:

Concept:

Sodium aluminate(III) acts as a coagulant in water treatment.

Explanation:

Sodium aluminate,

\mathrm{NaAlO_2}

, reacts with hardness-causing ions and forms a gelatinous precipitate of aluminium hydroxide, which traps suspended impurities and helps them settle.

This process is called coagulation.

Answer:

A. cause coagulation

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