[BluePill]

Question:

The ionic mobility for some ions in water at 298 K are given as following:

K⁺ = 7.616 x 10^-4
Ca²⁺ = 12.33 x 10^-4
Br^- = 8.09 x 10^-4
SO₄^2- = 16.58 x 10^-4

Find Kd of CaSO₄

Attempt:

Ok, so I'm stuck here. I've used Ostwald's dilution law to derive:


I don't have the molar conductivity of CaSO₄. I can get the molar conductivity at infinite dilution though.