A) \[2\text{ }log\text{ }3/4\]
B) \[2\text{ }log\text{ }1/4\]
C) \[log\text{ }1/3\]
D) \[2\text{ }log\text{ }3\]
Correct Answer: D
Solution :
\[\underset{V=1}{\mathop{C{{H}_{3}}}}\,COOH+\underset{0.1}{\mathop{Na}}\,OH\,\rightleftharpoons \underset{0.1}{\mathop{C{{H}_{3}}}}\,COONa+{{H}_{2}}O\] \[\frac{1}{4}\] th stage 0.75 0.75 0.25 \[pH\,=pKa\,+\log \,\frac{(C{{H}_{3}}COONa)}{(C{{H}_{3}}\,COOH)}\,=pKa\,+\log \left( \frac{1}{3} \right)\] \[\underset{V=1}{\mathop{C{{H}_{3}}}}\,COOH+\underset{0.1}{\mathop{NaOH}}\,\,\underset{0.1}{\mathop{\rightleftharpoons }}\,C{{H}_{3}}COONa\,+{{H}_{2}}O\] \[\frac{3}{4}\] th stage 0.75 0.75 0.25 \[p'H\,=pKa+\log \,\left( \frac{3}{1} \right)\] \[\Rightarrow \,\,\,\,\,\,\,\,\,\Delta pH\,=\log \,3-\log \left( \frac{1}{3} \right)\,=2\log \,3\].You need to login to perform this action.
You will be redirected in
3 sec