27. Solving a chemistry problem

2. The resistivity of a saturated solution of sparingly soluble salt A at 298 K is equal to ρ. Specific resistance of water at the same temperature ρ H2O = 1*104 Ohm*m. Calculate: 1) the solubility of salt A in pure water; 2) the product of the solubility of substance A, assuming that the ion activity coefficients γ± = 1 (solutions are highly diluted); 3) the solubility of substance A in a solution containing 0.01 mol of substance B; 4) solubility of substance A in a solution containing 0.01 mol of substance C. Substances A, B, C are completely dissociated.
N option Ρ*10-4, Ohm•m Substance
A B C
2 0.333 AgCl HCl Na2SO4