Which of the following solutions will act as | vedclass

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(D) buffer solution is formed by a mixture of a weak acid and its conjugate base,or a weak base and its conjugate acid. In option $D$,we have $10 \ mL

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$10 \ mL$ of $0.1 \ M$ $H_2S$ + $15 \ mL$ of $0.1 \ M$ $Na_2S$

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(D) buffer solution is formed by a mixture of a weak acid and its conjugate base,or a weak base and its conjugate acid. In option $D$,we have $10 \ mL$ of $0.1 \ M$ $H_2S$ (weak acid) and $15 \ mL$ of $0.1 \ M$ $Na_2S$ (salt of weak acid and strong base). The reaction is: $H_2S + Na_2S \rightarrow 2NaHS$. Initial moles: $H_2S = 1 \ mmol$,$Na_2S = 1.5 \ mmol$. After reaction: $H_2S$ is consumed,$NaHS$ is formed $(1 \ mmol)$,and $Na_2S$ remains $(0.5 \ mmol)$. This results in a mixture of $NaHS$ (weak acid) and $Na_2S$ (conjugate base),which forms an acidic buffer system.

Which of the following solutions will act as a buffer solution?

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