The Molarity (M) of an aqueous solution containing 5.85 g of NaCl in 500 mL water is:

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Solution

Q.
The Molarity (M) of an aqueous solution containing 5.85 g of NaCl in 500 mL water is:
(Given: Molar Mass Na : 23 and Cl : 35.5 g ${mol}^{- 1}$ ) [2024]

1 0.2

2 20

3 4

4 2

Ans.
(1)

Assuming volume of solution same as volume of water,

$V_{solution} = 500 mL = 0.5 L$

$n_{solute} = \frac{W_{solute}}{M_{solute}} = \frac{5.85 g}{58.5 {g mol}^{- 1}} = 0.1 mol$

$M = \frac{n_{solute}}{V_{solution} (in L)} = \frac{0.1 mol}{0.5 L} = 0.2 M$

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