Question

What is the normality of 1 M $H_{3}P{O}_4$ solution?

• A. 0.5 N
• B. 1.0 N
• C. 2.0 N
• D. 3.0 N

Answer 1

The correct option is D 3.0 N

1 mol of $H_{3}P{O}_4$ gives 3 moles of $H^{+}$ ions

In Phosphoric acid ($H_{3}P{O}_4)$ no. of $H^{+}$ ions it produces on dissociation per molecule of acid is 3. Hence the n-factor for phosphoric acid $H_{3}P{O}_4$ is 3.

Normality= Molarity $\times n-factor$

=1$\times$ 3 =3 N

Hence, the correct option is $D$