Question

The molarity of $NaOH$ prepared by dissolving its $4$ g in $250$ ml of the solution is:

• A. $0.2$
• B. $0.4$
• C. $0.1$
• D. $0.25$

Answer 1

The correct option is B $0.4$

The formula for the molarity of $NaOH$ is $M=\frac{\text{Weight}}{\text{Gram Molecular Weight}}\times \frac{1000}{\text{Volume}\left(\text{in ml}\right)}$

Substituting values in the above equation, we get $M=\frac{4}{40}\times \frac{1000}{250}=0.4M$.