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Refer to an aqueous solution of formic a...

Refer to an aqueous solution of formic acid, `HCOOH`, which has a `K_(a)` value of `1.9 xx 10^(-4)` at `25^(@)C`.
How many moles of sodium formate must be added to `1.0L` of a `0.20M` formic acid solution to produce a pH of `4.00` ?

A

`0.38`

B

`0.80`

C

`1.9`

D

`3.8`

Text Solution

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The correct Answer is:
a
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