An acidic buffer is obtained on mixing

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(C) An acidic buffer is formed by a mixture of a weak acid and its salt with a strong base.In option $C$,we have $100 \ mL$ of $0.1 \ M \ HCl$ $(10 \

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$100 \ mL$ of $0.1 \ M \ HCl$ and $200 \ mL$ of $0.1 \ M \ CH_3COONa$

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(C) An acidic buffer is formed by a mixture of a weak acid and its salt with a strong base.In option $C$,we have $100 \ mL$ of $0.1 \ M \ HCl$ $(10 \ mmol)$ and $200 \ mL$ of $0.1 \ M \ CH_3COONa$ $(20 \ mmol)$.The reaction is: $HCl + CH_3COONa \rightarrow CH_3COOH + NaCl$Initial moles: $10 \ mmol \ HCl$ and $20 \ mmol \ CH_3COONa$.After reaction: $0 \ mmol \ HCl$,$10 \ mmol \ CH_3COONa$ remaining,and $10 \ mmol \ CH_3COOH$ formed.Since the final mixture contains a weak acid $(CH_3COOH)$ and its conjugate base ($CH_3COO^-$ from $CH_3COONa$),it acts as an acidic buffer.

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