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JAMB Chemistry 2019 Paper

Question : 52

Total: 80

The two ions responsible for hardness in water are

Solution:

Concept:

Hardness of water is mainly caused by dissolved calcium and magnesium ions.

Explanation:

The two ions responsible for hardness in water are

\mathrm{Ca}^{2+}

and

\mathrm{Mg}^{2+}

These ions react with soap to form insoluble precipitates, reducing lather formation.

Answer:

\mathrm{Ca}^{2+}

and / or

\mathrm{Mg}^{2+}

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