Aqueous solutions of HNO_3,KOH,CH_3COOH,and C | vedclass

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(C) buffer solution is formed by a mixture of a weak acid and its conjugate base or a weak base and its conjugate acid.$1$. In option $C$,$HNO_3$ (str

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$C, D$

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(C) buffer solution is formed by a mixture of a weak acid and its conjugate base or a weak base and its conjugate acid.$1$. In option $C$,$HNO_3$ (strong acid) reacts with $CH_3COONa$ (salt of weak acid) to form $CH_3COOH$ (weak acid) and $NaNO_3$. If $HNO_3$ is the limiting reagent,the resulting mixture contains $CH_3COOH$ and $CH_3COONa$,which acts as an acidic buffer.$2$. In option $D$,the mixture contains $CH_3COOH$ (weak acid) and $CH_3COONa$ (conjugate base),which is a classic acidic buffer system.Therefore,both $C$ and $D$ can form a buffer.

Buffer Solution	Volume of $0.1 \ M$ Weak Acid (mL)	Volume of $0.1 \ M$ Sodium Salt (mL)
$I$	$4.0$	$4.0$
$II$	$4.0$	$40.0$
$III$	$40.0$	$4.0$
$IV$	$0.1$	$10.0$

Aqueous solutions of $HNO_3$,$KOH$,$CH_3COOH$,and $CH_3COONa$ of identical concentrations are provided.
The pair$(s)$ of solutions which form a buffer upon mixing is(are):
$A$. $HNO_3$ and $CH_3COOH$
$B$. $KOH$ and $CH_3COONa$
$C$. $HNO_3$ and $CH_3COONa$
$D$. $CH_3COOH$ and $CH_3COONa$

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Buffer Solution Volume of $0.1 \ M$ Weak Acid (mL) Volume of $0.1 \ M$ Sodium Salt (mL)

$I$ $4.0$ $4.0$

$II$ $4.0$ $40.0$

$III$ $40.0$ $4.0$

$IV$ $0.1$ $10.0$

Which of the two sets of buffer solutions have the least $pH$?

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Aqueous solutions of $HNO_3$,$KOH$,$CH_3COOH$,and $CH_3COONa$ of identical concentrations are provided.The pair$(s)$ of solutions which form a buffer upon mixing is(are):$A$. $HNO_3$ and $CH_3COOH$$B$. $KOH$ and $CH_3COONa$$C$. $HNO_3$ and $CH_3COONa$$D$. $CH_3COOH$ and $CH_3COONa$