Q 2670856716.     At what `([Br^-])/sqrt([CO_3^(2-)]) ` does the following cell have its reaction at equilibrium?

`Ag(s) | Ag_2 CO_3 (s) | Na_2 CO_3 (aq) || KBr (aq) | Ag Br(s) | Ag (s)`

`K_(sp) = 8 xx 10^(-12)` for `Ag_2CO_3` and `K_(ap = 4 xx 10 ^(-13)` for AgBr


A

`sqrt1 xx 10^-7`

B

`sqrt2 xx 10^-7`

C

`sqrt3 xx 10^-7`

D

`sqrt4 xx 10^-7`

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