Question

What is the normality of 0.30 M ${{H}_{3}}P{{O}_{4}}$ (a tribasic acid) in the following reaction? ${{H}_{3}}P{{O}_{4}}+2O{{H}^{-}}\xrightarrow{{}}HPO_{4}^{--}+2{{H}_{2}}O$

• A. 0.30 N
• B. 0.60 N
• C. 0.90 N
• D. 0.15 N

Answer 1

Answer: (B)

0.60 N

Answer 2

In the given reaction, two hydrogen atoms are replaced. Hence, here, phosphoric acid is showing 2 basicity. $\therefore$ Normality = molarity $\times$ basicity $=0.30\times 2=0.60\,N$