K_{a} values for acids H_{2}SO_{3},HNO_{2},CH | vedclass

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(D) The strength of an acid is directly proportional to its $K_{a}$ value,while the strength of its conjugate base is inversely proportional to the $K

Vedclass · Accepted Answer

$HCN$

Vedclass · Answer

(D) The strength of an acid is directly proportional to its $K_{a}$ value,while the strength of its conjugate base is inversely proportional to the $K_{a}$ value of the parent acid.Therefore,the acid with the lowest $K_{a}$ value will produce the strongest conjugate base.Comparing the given $K_{a}$ values: $1.3 	imes 10^{-2} > 4 	imes 10^{-4} > 1.8 	imes 10^{-5} > 4 	imes 10^{-10}$.Since $HCN$ has the lowest $K_{a}$ value $(4 	imes 10^{-10})$,it produces the strongest conjugate base.

$K_{a}$ values for acids $H_{2}SO_{3}$,$HNO_{2}$,$CH_{3}COOH$ and $HCN$ are respectively $1.3 \times 10^{-2}$,$4 \times 10^{-4}$,$1.8 \times 10^{-5}$ and $4 \times 10^{-10}$. Which of the above acids produces a stronger conjugate base in aqueous solution?

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