Question

Consider the solubility of CaSO4 (Ksp = 2.4E-5). Find [Ca2+] in 0.013 M KNO3.

Approach:

1. Find ionic strength based on KNO3.

2. Write the equilibrium rxn.

3. Write the equilibrium expression with Activities.

Answer 1

1 20013 M [kNg ) 20013 m. Jone strength, " 2 & E 1 {ç22. charge of a 2, ? 2 concentration charge th non ith non. of =) Iunie - strength a { ckt) (+1)2 + (ng) (-1) 2 (0-013 +0.013) 2 D-013 m 2) equilibrium reaction caso is a cathy trail run i ot -1 (а 2 osvy) & Latz [cate) Son (502) and achoty (oefficient ) or cat2 and so? extended debye huckel equation. so using u tog YA 2 - 0 51 x 2 x +33x A x Ju 2 2 ron's charge d e diameter od hydrated non (in nm). for cate, z = +2 SA2²0.6mm -0.51 (2) ² x 0. 013 It 3.3x0 6x Jo-013 2) log Veath i-0-190 2) Scat2 a 150.190 2 0-646