Test Index

JAMB Chemistry 2019 Paper

© africaexams.com

Question : 31

Total: 80

At 27°C, 58.5g of sodium chloride is present in 250cm

^{3}

of a solution. The solubility of sodium chloride at this temperature is?

(molar mass of sodium chloride = 111.0gmol

^{-1}

)

2.0 moldm $^{-3}$
0.25 moldm $^{-3}$
1.0 moldm $^{-3}$
0.5 moldm $^{-3}$

Solution:

Given the Mass of the salt = 58.5g

Volume = 250 cm $^{3}$ = 0.25 dm $^{3}$

Mass concentration = $\frac{\text{Mass}}{\text{Volume}}$

= $\frac{58.5}{0.25}$ = 234 gdm $^{-3}$

Solubility (in moldm $^{-3}$ = $\frac{234}{111}$

= 2.11 moldm $^{-3}$

$\approx \text{eq}$ 2.0 moldm $^{-3}$

© africaexams.com

Go to Question:

Prev Question

Next Question