Question

What is the molarity of a 4% W/V $NaOH$ solution ?

• A. 0.1 M
• B. 0.01 M
• C. 1 M
• D. 10 M

Answer 1

The correct option is C 1 M

4 % W/V means, $4g$ of $NaOH$ is present in $100mL$ of solution. So, for every $100mL$ of solution,
we have,
$\text{Moles of NaOH}=\frac{4}{40}=0.1mol$
$Molarity=\frac{molesofNaOH}{Volumeofthesolution\left(inL\right)}=\frac{0.1\times 1000}{100}=1M$