question_answer

A weak acid, \[\Delta H,\] has a \[{{K}_{a}}\] of \[1.00\times {{10}^{-5}}\]. If 0.100 mole of this acid is dissolved in one litre of water, the percentage of acid dissociated at equilibrium is closest to:                                        [AIPMT (S) 2007]

A)  99.0%   

B)                   1.00%

C)  99.9%   

D)                   0.100%

Correct Answer: B

Solution :

           

% of acid dissociated =

= 1%