Assignment 2 Question No. 1. Write the solubility product constant expressions (K) for the following solubility Equilibria: (2.0mark) Ca:PO...+H.O. AKOH+H.O AP 3 ng 210, 30H Question No. 2: What are the different kinds of precipitates obtained in gravimetric analysis? Give one example for each (3.0 marks) Question No. 3: A solution is prepared by mixing equal volumes of 2.0' 10M Barium chloride (BaCl) solution and 3.0 10M sodium phosphate (Na PO, ) solution at 25C. Would Ba (PO) precipitate out? K of Ba(PO) at 25C is 3.0 10 (3.0 marks) Question No. 4. A solution is prepared by mixing equal volumes of 0.01 M CaCl and 0.001 H.SO. Would Caso (Calcium sulfate) precipitate? K of Caso, is 2.3 x 10* at 25C. (3.0 marks) Question No. 5. A 3.00-g sample of an alloy (containing only Pb Lead and Sn Tin) was dissolved in nitric acid (HNO, Sulfuric acid was added to this solution, which precipitated 1.69 g of Pso. Assuming that all of the lead was precipitated, what is the percentage of Sn in the sample? (Given the atomic mass of Pb = 207 and Sn = 50, S-320-16) (3.0 marks) Questio the various steps involved in gravimeric analysis of the given sample marks) Question No. 7. Write any four criteria for precipitation (2.0 marks)