Question

Which of the following solutions is more concentrated than the others?

• A. 5.3 gm of $N{a}_{2}C{O}_3$ in 500 ml solution
• B. 5 gm of $NaOH$ in 100 ml solution
• C. 3.65 gm of $HCl$ in 750 ml solution
• D. 4.9 gm of $H_{2}S{O}_4$ in 1000 ml solution

Answer 1

The correct option is B 5 gm of $NaOH$ in 100 ml solution

Molarity (M) $=\frac{n}{V\left(inml\right)}\times 1000$

$\left[A\right]M=\frac{5.3}{106}\times \frac{1000}{500}=0.1$

$\left[B\right]M=\frac{5}{40}\times \frac{1000}{100}=1.25$

$\left[C\right]M=\frac{3.65}{36.5}\times \frac{1000}{750}=0.133$

$\left[D\right]M=\frac{4.9}{98}\times \frac{1000}{1000}=0.05$

$\left[B\right]$ is the most concentrated solution.