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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 `0.5 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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