question_answer

The hydrogen ion concentration in weak acid of dissociation constant \[{{K}_{a}}\]and concentration \[c\] is nearly equal to [CBSE PMT 1989; RPMT 2000]

A)                 \[\sqrt{{{K}_{a}}/c}\]     

B)                 \[c/{{K}_{a}}\]

C)                 \[{{K}_{a}}c\]    

D)                 \[\sqrt{{{K}_{a}}c}\]