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20 mL of 0.1 M weak acid HA(K(a)=10^(-5)...

20 mL of 0.1 M weak acid `HA(K_(a)=10^(-5))` is mixed with solution of 10 mL of 0.3 M HCl and 10 mL. of 0.1 M NaOH. Find the value of `[A^(-)]`//([HA]+[A^(-)])` in the resulting solution :

A

`2xx10^(-4)`

B

`2xx10^(-5)`

C

`2xx10^(-3)`

D

`0.05`

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