Answer to Question #52982 in Organic Chemistry for shane

Question

Barium sulfate, BaSO4, is so insoluble that it can be swallowed without significant danger, even though Ba2+ ions are toxic. At 25 °C, 1.00 L of water dissolves only 0.00245 g BaSO4. Calculate Ksp for BaSO4.

Answer 1

Moles of dissolved BaSO4 = 0.00245 g / 233.43 g/mol = 0.0000105 mol;
[Ba²⁺]= [SO4^2-] = 0.0000105mol/ 1.00 L = 0.0000105 M;
K_sp = [Ba²⁺][SO4^2-]=(0.0000105)² =1.1 x 10^-10

Answer: 1.1 x 10^-10