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Suggest a reason why HF is a weak acid, wheres binary acids of the all other halogens are strong acids. |
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Answer» SOLUTION :The hydrogen halides are extremely soluble in water due to the ionisation. `underset("(X = F, Cl, Br or I)")(X+H_(2)Orarr H_(2)O^(+)+X^(-))` Solutions of hydrogen halides are therefore acidic and known as hydrohalic acids. Hydrochloric, hydrobromic and hydroiodic acids are almost completely ionised and are therefore STRONG acids but HF is a weak acid. For HF, `HF+H_(2)OhArr H_(3)O^(+)+F^(-)` `HF+F^(-)rarr HF_(2)^(-)` At high concentration, the equilibrium involves the REMOVAL of fluoride ions is IMPORTANT. Since it affects the dissociation of hydrogen fluoride, therefore it is a weak acid.. |
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