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What concentration of HCOO^(-) is presen...

What concentration of `HCOO^(-)` is present in a solution of weak of `0.01` M HCOOH `(K_(a)=1.8xx10^(-4)` and `0.01` M HCl?

A

`1.8xx10^(-3)`

B

`10^(-2)`

C

`1.8xx10^(-4)`

D

`10^(-4)`

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