Question

The molarity of a solution containing 1.0 g NaOH in 250 mL of water is:

• A. 0.5 M
• B. 0.4 M
• C. 0.1 M
• D. 2.0 M

Answer 1

The correct option is C 0.1 M

Mass of NaOH (m) $=$ 1g

The volume of water (V) $=$ 250 ml

Mol. wt of NaOH (m) $=$ 40g/mol

Molarity (M) $=\frac{m\times 1000}{M\times V\left(ml\right)}$

$M=\frac{1\times 1000}{40\times 250}$

$M=\frac{1}{10}$ or 0.1 M

Hence, the correct option is $\text{C}$