Q 2622178031.     A `Tl^+ // Tl` : couple was prepared by saturating `"0.1 M KBr"` with `T lBr` and allowing the `Tl^+` from the telatively insoluble bromide to equilibrate. This couple was observed to have a potential of `"-0.443 V"` with respect to `(Pb^(2+ ))/Pb` couple in which `Pb^(2+)` was `"0.1 M"`. What is `K_(sp)` of `TlBr`.

(Report answer in multiplication of `10^-8`)` \ \ \ \ ( E_(pb^(2+)//Pb)^o = -0.126, E_(Tl^+//Tl) = -0.336 V)`

(take antilog (0.5509) `= 3.55, (2.303 RT)/F = 0.059`)

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