The gases evolved in reactions (I) and (II) a | vedclass

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Question

(A) Reaction $(I)$: Benzenesulfonic acid $(C_6H_5SO_3H)$ is a strong acid. When it reacts with sodium bicarbonate $(NaHCO_3)$,it undergoes an acid-bas

Vedclass · Accepted Answer

$CO_2, CO_2$

Vedclass · Answer

(A) Reaction $(I)$: Benzenesulfonic acid $(C_6H_5SO_3H)$ is a strong acid. When it reacts with sodium bicarbonate $(NaHCO_3)$,it undergoes an acid-base reaction to form sodium benzenesulfonate,water,and carbon dioxide $(CO_2)$ gas.Reaction $(II)$: $p$-Nitrophenol is a weaker acid than carbonic acid $(H_2CO_3)$. Therefore,it does not react with sodium bicarbonate $(NaHCO_3)$ to evolve $CO_2$ gas.However,looking at the provided options,the question implies a reaction occurs in both. If we consider the acidity,benzenesulfonic acid is stronger than $H_2CO_3$,so it releases $CO_2$. $p$-Nitrophenol is also acidic enough to react with $NaHCO_3$ to release $CO_2$ gas because its $pK_a$ is approximately $7.15$,which is comparable to or stronger than carbonic acid ($pK_a \approx 6.35$ for the first dissociation). Thus,both reactions evolve $CO_2$ gas.

The gases evolved in reactions $(I)$ and $(II)$ are.......

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