Question

Heat of neutralization of a strong acid by a strong base is a constant value because

• A. salt formed does not hydrolyse
• B. only $H ^{+}$ and $OH ^{-}$ ions react in every case
• C. the strong base and strong acid do not react completely
• D. the strong base and strong acid react in aqueous solution

Answer 1

Answer: (B)

For example: $Na ^{+}+ OH ^{-}+ H ^{+}+ Cl ^{-} \rightarrow Na ^{+}+ Cl ^{-}+ H _{2} O$

i.e., $H ^{+}+ OH ^{-} \rightarrow H _{2} O$

Thus heat of neutralization of a strong acid with strong base is constant.