AP EAMCET · Chemistry · Ionic Equilibrium
Calculate the molar ratio of a weak acid \(\mathrm{H} A\left(K_a=10^{-6}\right)\) and its salt with strong base, so that the \(\mathrm{pH}\) of buffer solution is 6 .
- A 10
- B 1
- C 6
- D 0.1
Answer & Solution
Correct Answer
(D) 0.1
Step-by-step Solution
Detailed explanation
\begin{aligned} & \mathrm{pH}=\mathrm{pK}+\log \frac{[\text { Salt }]}{[\text { Acid }]} \log \frac{[\text { Salt }]}{[\text { Acid }]} \\ & =\frac{\mathrm{pH}}{\mathrm{p} K_a}=\frac{6}{6}=1 \\ & {\left[K_a=10^{-6} \therefore \mathrm{p} K_a=-\log K_a=\log \left(10^{-6}\right)…
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