12. The following quantities of salts were added to a volume of water to make 1 liter of solution: 1 x 10-2moles NaCl 2 x 10-2 moles CaCl, 2 × 10-² moles BaCl, (a) What is the ionic strength of the solution? (b) A small amount of phosphate salt is added to the same solution with negligible change in ionic strength. Given K = 10-7-2 for the reaction H,PO,= H+ + HPO,?- Calculate [H*][HPO,²-]/[H,PO,"), called °K, using the Güntelberg ap- proximation of the DeBye-Hückel law. (c) Calculate the "salting-out" coefficient, k,, for a nonelectrolyte in the same solution if its activity is 10-3 M and its concentration is 9.5 x 10 M.

12. The following quantities of salts were added to a volume of water to make 1 liter of solution: 1 x 10-2moles NaCl 2 x 10-2 moles CaCl, 2 × 10-² moles BaCl, (a) What is the ionic strength of the solution? (b) A small amount of phosphate salt is added to the same solution with negligible change in ionic strength. Given K = 10-7-2 for the reaction H,PO,= H+ + HPO,?- Calculate [H*][HPO,²-]/[H,PO,"), called °K, using the Güntelberg ap- proximation of the DeBye-Hückel law. (c) Calculate the "salting-out" coefficient, k,, for a nonelectrolyte in the same solution if its activity is 10-3 M and its concentration is 9.5 x 10 M.

Chemistry for Engineering Students

4th Edition

ISBN:9781337398909

Author:Lawrence S. Brown, Tom Holme

Publisher:Lawrence S. Brown, Tom Holme

Chapter12: Chemical Equilibrium

Section: Chapter Questions

Problem 12.11PAE

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