Question

What is the molarity of $0.2NN{a}_{2}C{O}_3$ solution?

• A. 0.1 M
• B. 0 M
• C. 0.4 M
• D. 0.2 M

Answer 1

Answer: (A)

Molarity $=$ Normality $\times n_f$

$\Rightarrow$ Molarity $=\frac{\text{ Normality }}{n_f}$

$\because n_f=2$ for $N{a}_{2}C{O}_3$)

$\therefore$ Molarity $=0.2\times \frac{M}{2M}=0.1M$