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F- has higher...

Question

F- has higher hydration enthalpy and larger electronegativity, but still HI is more acidic than HF, why so?

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Solution

Dear Student,

HI is more stronger acid than HF due to higher stability of I^- in comparison to F^-. Although F is more electronegative than I, yet due to the bigger size of I, the negative charged is dispersed more properly and so I^- is more stable.
Hence, HI is more stronger acid than HF.

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