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  4. Why is the heat evolved in neutralization of HF is highest

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Q. Why is the heat evolved in neutralization of HF is highest

UPSEEUPSEE 2018

Solution:

Due to high hydration energy of $F ^{-}$ ion.

Although HF is a weak acid, its enthalpy change of neutralisation is very high, (more negative) $-57.3\, kJ$

This is due to high hydration energy of $F ^{-}$ ion. The size of $F ^{-}$ is very small and thus it can form strong bond with water molecule when it is hydrated.