An acid HA ionises as

Question:

An acid HA ionises as

$\mathrm{HA} \rightleftharpoons \mathrm{H}^{+}+\mathrm{A}^{-}$

The $\mathrm{pH}$ of $1.0 \mathrm{M}$ solution is 5 . Its dissociation constant would be :-

 

  1. $1 \times 10^{-10}$

  2. 5

  3. $5 \times 10^{-8}$

  4. $1 \times 10^{-5}$


Correct Option: 1

Solution:

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