First slide

Concentration methods

Question

Molality of 10 grams of aqueous solution containing 2 grams of caustic soda is

Moderate

A

5 m
B

7.2 m
C

6.25 m
D

4.2 m

Solution

$W_{solute} = 2 g; GMW of solute = 40 g; W_{solution} = 10 g; W_{solvent} = (10 - 2) g; m = \frac{2}{40} \times \frac{1000}{8} = 6.25 m$

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