What is the pKa of HCl (aq)?

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What is the pKa of HCl (aq)?

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Answer 1 · 2018-06-17T06:42:00

This is not measured in water....

Explanation:

..because in water, the protonolysis reaction is more or less quantitative...

$H X (a q) + H_{2} O (l) ⇌ H_{3} O^{+} + X^{-}$ $HX(aq) + H_2O(l) rightleftharpoonsH_3O^+ + X^-$

This site gives $p K_{a}$ $pK_a$ values of $- 8.08$ $-8.08$ , $- 10.3$ $-10.3$ , and $- 10.7$ $-10.7$ for $H C l$ $HCl$ , $H B r$ $HBr$ , and $H I$ $HI$ respectively. The order of acidity is what we would expect on the basis of hydrogen-halogen overlap. The other hydrogen halide, $H F$ $HF$ , is NOT a strong Bronsted acid for what reason?

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What is the pKa of HCl (aq)?

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