Calculate the morality of $N a O H$ in the solution prepared by dissolving its $4 g$ in water to make solution of $250 m l$ .

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Solution

Weight of $N a O H = 4 g$

Molecular weight of $N a O H = 40 G$

Volume of solution is $250 m l$

Molarity = ?

$M = \frac{W}{M W} \times \frac{1000}{V i n m l}$

$M = \frac{4}{40} \times \frac{1000}{250}$
$0.4 M$

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