Which among the following pairs is not an aci | vedclass

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(B) An acidic buffer is a solution that resists changes in $pH$ and is prepared by mixing a weak acid with its salt of a strong base.$HCOOH$ (weak aci

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$HClO_4 \& NaClO_4$

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(B) An acidic buffer is a solution that resists changes in $pH$ and is prepared by mixing a weak acid with its salt of a strong base.$HCOOH$ (weak acid) and $HCOOK$ (salt) form an acidic buffer.$C_6H_5COOH$ (weak acid) and $C_6H_5COONa$ (salt) form an acidic buffer.$HCN$ (weak acid) and $KCN$ (salt) form an acidic buffer.$HClO_4$ is a strong acid,and $NaClO_4$ is its corresponding salt. $A$ mixture of a strong acid and its salt does not act as a buffer solution because a buffer requires a weak acid to maintain the equilibrium $HA \rightleftharpoons H^+ + A^-$. Therefore,$HClO_4 \& NaClO_4$ is not an acidic buffer.

Which among the following pairs is not an acidic buffer?

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