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WAEC Chemistry 2024 Paper

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Question : 14

Total: 50

At 25

^0

C, the saturated solution of a salt in water was found to contain 0.24g of the salt in 100cm

^3

. What is the solubility of the salt in gdm

^{-1}

?

0.024
0.240
2.40
24.0

Solution:

Concept:

Solubility is the mass of salt dissolved in

1\,\mathrm{dm^3}

of saturated solution.

Explanation:

Given:

0.24\,\mathrm{g}

of salt dissolves in

100\,\mathrm{cm^3}

.

Since

1\,\mathrm{dm^3} = 1000\,\mathrm{cm^3}

, convert the volume to

\mathrm{dm^3}

.

100\,\mathrm{cm^3} = 0.1\,\mathrm{dm^3}

.

Solubility

= \frac{0.24\,\mathrm{g}}{0.1\,\mathrm{dm^3}} = 2.40\,\mathrm{g\,dm^{-3}}

.

This matches option C.

Answer:

C.

2.40\,\mathrm{g\,dm^{-3}}

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