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Question

(A) The acidic strength of an acid is directly proportional to its ability to release $H^+$ ions,which is inversely proportional to its $pKa$ value $(

Vedclass · Accepted Answer

$HClO_4 < HNO_3 < H_2CO_3 < B(OH)_3$

Vedclass · Answer

(A) The acidic strength of an acid is directly proportional to its ability to release $H^+$ ions,which is inversely proportional to its $pKa$ value $(Acidic \ Strength \ \propto \frac{1}{pKa})$.The order of acidic strength is: $HClO_4 > HNO_3 > H_2CO_3 > B(OH)_3$.$HClO_4$ is a very strong acid due to the high oxidation state of $Cl$ and the stability of the perchlorate ion.$HNO_3$ is a strong acid,$H_2CO_3$ is a weak acid,and $B(OH)_3$ (boric acid) is a very weak Lewis acid.Since the $pKa$ value is inversely proportional to acidic strength,the order of increasing $pKa$ values is the reverse of the order of acidic strength:$HClO_4 < HNO_3 < H_2CO_3 < B(OH)_3$.

Which of the following represents the correct order of increasing $pKa$ values for the given acids?

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