Test Index

WAEC Chemistry 2018 Paper

© africaexams.com

Question : 5

Total: 50

What is the solubility of a salt if 0.4g of it is obtained on evaporating 200

\mathrm{cm}^{3}

of its saturated solution to dryness?

0.08 $\mathrm{gdm}^{-3}$
2.00 $\mathrm{gdm}^{-3}$
8.00 $\mathrm{gdm}^{-3}$
80.00 $\mathrm{gdm}^{-3}$

Solution:

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

200 $\mathrm{cm}^{3}$ = 0.2 $\mathrm{dm}^{3}$

⇒ 0.2 $\mathrm{dm}^{3}$ contains 0.4g

hence, solubility of the salt which is the amount of the salt dissolvable in 1 $\mathrm{dm}^{3}$ is

$\; \frac{0.4\mathrm{g}}{0.2\mathrm{dm}^{3}} = 2.0\mathrm{gdm}^{-3}$

© africaexams.com

Go to Question:

Prev Question

Next Question