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)

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 $