Question

The normality of 1% (weight/volume) $H_{3}P{O}_4$ is nearly:

• A. 0.02
• B. 0.3
• C. 0.1
• D. 1

Answer 1

The correct option is B 0.3

100 ml solution contains 1 gm $H_{3}P{O}_4$

1000 ml solution contains 10 gm $H_{3}P{O}_4$

Molarity of $H_{3}P{O}_4=\frac{10}{98}=0.1$

As $H_{3}P{O}_4$ is a tribasic acid, normality will be 3 times the molarity.

Normality $=$ 0.3N