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WAEC Chemistry 2018 Paper

Question : 15

Total: 50

KNO_{3}

NaNO_{3}

Solution:

Concept:

The solubility of two solutes is equal at the temperature where their solubility curves intersect.

Explanation:

Look for the point where the curve for

\mathrm{KNO}_{3}

crosses the curve for

\mathrm{NaNO}_{3}

From that intersection, trace downward to the temperature axis.

The corresponding temperature is

30^\circ\mathrm{C}

Answer:

30^\circ\mathrm{C}

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