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  4. What is the pH at equivalence point in the titration of 0.1 M CH 3 COOH and 0.1 M NaOH ? (ka for acetic acid is .1.8 × 10-5)

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Q. What is the $pH$ at equivalence point in the titration of $0.1 M\, CH _{3} COOH$ and $0.1\, M\, NaOH$ ? $(k_{a}$ for acetic acid is $\left.1.8 \times 10^{-5}\right)$

Equilibrium

Solution:

For weak acid and strong base;

$pH =7+\frac{1}{2} pK _{ a }+\frac{1}{2} \log \,c$

$=7+\frac{4.74}{2}+\frac{1}{2} \log 10^{-1}=8.87$