$18\;{\rm{mL}}$ of mixture of acetic acid and sodium acetate required $6\;mL$ of $0.1\;M\;{\rm{NaOH}}$ for neutralization of the acid and ${\rm{12}}\;{\rm{mL}}$ of ${\rm{p}}{K_a}$ of the acid is $4.75,$ what is the $pH$ of the mixture?

JEE CHEMISTRY MCQ: Equilibrium

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Application +4 | -1

18\;\mathrm{mL}

of mixture of acetic acid and sodium acetate required

6\;mL

0.1\;M\;\mathrm{NaOH}

for neutralization of the acid and

\mathrm{12}\;\mathrm{mL}

\mathrm{p}{K_a}

of the acid is

4.75,

what is the

pH

of the mixture?

View answer and explanation

Correct option: A

5.05

Option A (5.05) is correct because it accurately calculates the pH of the buffer solution using the Henderson-Hasselbalch equation.

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\mathrm{K}_1

\mathrm{K}_2

\mathrm{N}_2(\mathrm{~g})+\mathrm{O}_2(\mathrm{~g}) \rightleftharpoons 2 \mathrm{NO}(\mathrm{g})\quad\ldots

\mathrm{NO}(\mathrm{g}) \rightleftharpoons \frac{1}{2} \mathrm{~N}_2(\mathrm{~g})+\frac{1}{2} \mathrm{O}_2(\mathrm{~g})\quad\ldots

K{a_1},\,\,\,K{a_2}\,\,\,\mathrm{and}\,\,\,K{a_3}

\begin{array}{l} {H_2}S\leftrightharpoons{H^ + } + H{S^ - }\\ H{S^ - }\leftrightharpoons{H^ + } + {S^{2 - }}\\ {H_2}S\leftrightharpoons2{H^ + } + {S^{2 - }} \end{array}

K{a_1},\,\,K{a_2}\,,K{a_3}

\mathrm{pH}

0.1 \mathrm{~M}-\mathrm{N}_2 \mathrm{H}_4

\mathrm{N}_2 \mathrm{H}_4,

K_{{b}_1}=3.6 \times 10^{-6}, K_{{b}_2}=6.4 \times 10^{-12}, \log 2=0.3

\log 3=0.48

{\text{Ba}}{{\text{O}}_2}(s) \rightleftharpoons {\text{BaO}}(s) + {{\text{O}}_2}(g);\Delta H = - {\text{ve}}.

\text{O}_2