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What concentration of FCH(2)COOH (K(a)=2...

What concentration of `FCH_(2)COOH` `(K_(a)=2.6xx10^(-3))` is needed so that `[H^(+)]`=2xx10^(-3)`?

A

`2xx10^(-3)` M

B

`2.6xx10^(-3)` M

C

`5.2xx10^(-3)` M

D

`3.53xx10^(-3)` M

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