Question

The limiting molar conductivities of $NaI$, $NaNO_3$ and $AgNO_3$ are $12.7$, $12.0$ and $13.3$ mS m2 mol–1, respectively (all at 25°C). The limiting molar conductivity of $AgI$ at this temperature is ____ mS m2 mol–1.

Answer 1

The limiting molar conductivity of $AgI$,
$Λ^0_m(AgI) = Λ^0_m(NaI)+Λ^0_m(AgNO_3)-Λ^0m(NaNO_3)$
$Λ^0_m(AgI) = 12.7 + 13.3 – 12.0$
$Λ^0_m(AgI) = 26 – 12$
$Λ^0_m(AgI) =14\ mS m^2 mol^{–1}$

So, the answer is $14\ mS m^2 mol^{–1}$.