Which of the following mixtures will form a b | 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 $D$,$HNO_3$ is a str

Vedclass · Accepted Answer

$0.2 \ mol \ HNO_3 + 0.3 \ mol \ NH_4OH$

Vedclass · Answer

(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 $D$,$HNO_3$ is a strong acid and $NH_4OH$ is a weak base. The reaction is: $HNO_3 + NH_4OH \rightleftharpoons NH_4NO_3 + H_2O$. Initial moles $(n_0)$: $HNO_3 = 0.2 \ mol$,$NH_4OH = 0.3 \ mol$. After the reaction $(n_f)$: $HNO_3 = 0 \ mol$,$NH_4OH = 0.1 \ mol$,$NH_4NO_3 = 0.2 \ mol$. Since we have a mixture of a weak base $(NH_4OH)$ and its salt with a strong acid $(NH_4NO_3)$,this forms a basic buffer solution.

Buffer Solution	Volume (in $mL$) of $0.1 \ M$ Weak acid	Volume (in $mL$) of $0.1 \ M$ sodium salt of weak acid
$I$	$4.0$	$4.0$
$II$	$4.0$	$40.0$
$III$	$40.0$	$4.0$
$IV$	$0.1$	$10.0$

Which of the following mixtures will form a buffer solution?

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Study the following table:
Buffer Solution Volume (in $mL$) of $0.1 \ M$ Weak acid Volume (in $mL$) of $0.1 \ M$ sodium salt of weak acid
$I$ $4.0$ $4.0$
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$III$ $40.0$ $4.0$
$IV$ $0.1$ $10.0$

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