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Q. 1 of 25
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40 ml of \( CH _{3} COOH \) solution is mixed with \( \vee \) ml of \( 0.4 M - NaOH \) solution. If the pH of resulting solution at equivalence point is 9.0 , the initial concentration of \( CH _{3} COOH \) solution is [ \( K _{a} \) of \( \left.CH _{3} COOH =2 \times 10^{-5}, \log 2=0.30\right] \)
A \( \quad 0.2 M \)
B \( \quad 0.1 M \)
c \( \quad 0.4 M \)
D \( \quad 0.8 M \)
Solution :
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