The $pH$ of an aqueous solution of ${\rm{C}}{{\rm{H}}_3}{\rm{COONa}}$ of concentration $C\left( {\rm{M}} \right)$ is given by

$7 - \frac{1}{2}p{K_a} - \frac{1}{2}\log C$

$\frac{1}{2}p{K_w} + \frac{1}{2}p{K_b} + \frac{1}{2}\log C$

$\frac{1}{2}p{K_w} - \frac{1}{2}p{K_b} - \frac{1}{2}\log C$

JEE CHEMISTRY MCQ: Equilibrium

1 Easy

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Application +4 | -1

The

pH

of an aqueous solution of

\mathrm{C}{\mathrm{H}_3}\mathrm{COONa}

of concentration

C\left( \mathrm{M} \right)

is given by

View answer and explanation

Correct option: D

\frac{1}{2}p{K_w} + \frac{1}{2}p{K_a} + \frac{1}{2}\log C

Option D (

\frac{1}{2}p{K_w} + \frac{1}{2}p{K_a} + \frac{1}{2}\log C

) is correct because it represents the pH of a salt of a weak acid and a strong base.

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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