SATHEE: Some Basic Concepts of Chemistry

Some Basic Concepts of Chemistry - Result Question 11

####11. A solution of sodium sulphate contains $92 g$ of $N a^{+}$ ions per kilogram of water. The molality of $N a^{+}$ ions in that solution in $m o l k g^{- 1}$ is

(2019 Main, 9 Jan I)

(a) 16

(b) 4

(d) 8

Show Answer

Solution:

Molality $(m) = \frac{Number of moles of solute}{Mass of solvent (in g)} \times 1000$

$\begin{aligned} = \frac{Mass of solute (in g) \times 1000}{[\begin{array}{r} Molecular weight of solute \times mass of solvent (in g) \end{array}]} & = \frac{w_{N a^{+}} \times 1000}{M_{N a^{+}} \times w_{H_{2} O}} = \frac{92 \times 1000}{23 \times 1000} = 4 m o l k g^{- 1} \end{aligned}$

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Some Basic Concepts of Chemistry - Result Question 11

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