Which of the following solutions will act as | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(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

Vedclass · Accepted Answer

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

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 $D$,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.

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 solutions will act as a buffer solution?

Similar Questions

$100 \ mL$ of a solution contains $0.1 \ M$ $NH_4OH$ and $0.1 \ M$ $NH_4Cl$. The $pH$ of the solution will not change on adding :-

$A$ buffer solution is prepared by mixing $0.1 \ M \ HCN$ and $0.2 \ M \ NaCN$. What is the $pH$ of the buffer solution if $pKa$ of $HCN$ is $9.3$? $(\log 2 = 0.3010)$

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
$I$ $4.0$ $4.0$
$II$ $4.0$ $40.0$
$III$ $40.0$ $4.0$
$IV$ $0.1$ $10.0$

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

Calculate $[H^{+}]$ of $0.2 \ M$ $HCN$ in $1 \ M$ $KCN$ solution. Given $K_{a(HCN)} = 4 \times 10^{-10}$.

What is the $pH$ of a buffer solution formed by mixing $0.01 \ M$ acetic acid and $0.05 \ M$ sodium acetate $(pK_a = 4.7447)$?

Vedclass Test Series

Exam Paper Generator

Online Exam Module