An amphoteric buffer solution in which conc. of ${{\rm{H}}^ + }\;{\rm{and}}\;{\rm{ H}}X$ is same. The value of ${K_a}\;{\rm{of }}\;{\rm{H}}X\;\;{\rm{is}}\;{10^{ - 8}}$, then $pH$ of buffer solution is

NEET UG CHEMISTRY MCQ: Equilibrium

1 Medium

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Application +4 | -1

An amphoteric buffer solution in which conc. of

{\mathrm{H}^ + }\;\mathrm{and}\;\mathrm{ H}X

is same. The value of

{K_a}\;\mathrm{of }\;\mathrm{H}X\;\;\mathrm{is}\;{10^{ - 8}}

, then

pH

of buffer solution is

View answer and explanation

Correct option: B

Option B (8) is correct because in an amphoteric buffer where [H+] = [HX], pH = pKa.

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Mg{(HC{O_3})_2}

MgC{O_3}

Mg{(OH)_2}

MgC{O_3}

K_{\mathrm{P}}

\mathrm{CaCO}_3

4.5 \times 10^{-2}

\mathrm{C}(\mathrm{s})+\mathrm{CO}_2(\mathrm{g}) \rightleftharpoons 2 \mathrm{CO}(\mathrm{g}),

K_{\mathrm{P}}

2.0 \mathrm{~atm}.

\mathrm{CaO}

\mathrm{CaCO}_3

+

\leftrightharpoons

\mathrm{PC}{\mathrm{l}_5}\leftrightharpoons\mathrm{PC}{\mathrm{l}_3} + \mathrm{C}{\mathrm{l}_2}

{K_{\mathrm{eq}}} = 0.41

\mathrm{p}{K_a}