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If 50ml of 0.2 M KOH is added to 40 ml o...

If 50ml of 0.2 M KOH is added to 40 ml of 0.05 M HCOOH, the pH of the resulting solution is (`K_(a)=1.8xx10^(-4)`)

A

3.75

B

5.6

C

7.5

D

3.4

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