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Homework 08

Homework 08 - Gadhia Tejas Homework 8 Due Nov 5 2007 11:00...

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Gadhia, Tejas – Homework 8 – Due: Nov 5 2007, 11:00 pm – Inst: James Holcombe 1 This print-out should have 24 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. The due time is Central time. 001 (part 1 of 1) 10 points The solubility product constant of PbCl 2 is 1 . 7 × 10 - 5 . What is the maximum concentra- tion of Pb 2+ that can be in ocean water that contains 0.0500 M NaCl? 1. 3 . 4 × 10 - 3 M 2. 6 . 8 × 10 - 3 M 3. 8 . 5 × 10 - 7 M 4. 1 . 7 × 10 - 3 M 5. 4 . 2 × 10 - 8 M 002 (part 1 of 1) 10 points Calculate the solubility of iron(III) hydrox- ide at pH = 3 . 8. The solubility product of iron(III) hydroxide is 2 × 10 - 39 . 003 (part 1 of 1) 10 points The mineral strontianite (SrCO 3 ) is quite in- soluble in water. The best reagent which could be added to dissolve a sample of stron- tianite is 1. HCl solution. 2. H 2 CO 3 solution. 3. SrCl 2 solution. 4. NaOH solution. 5. NH 3 solution. 004 (part 1 of 1) 10 points Consider the following K sp values for metal sulfides: CdS = 3 . 6 × 10 - 29 CoS = 5 . 9 × 10 - 21 CuS = 8 . 7 × 10 - 36 PbS = 8 . 4 × 10 - 28 Which pair would be most difficult to sepa- rate by fractional precipitation? 1. Cd +2 and Pb 2+ 2. Cu +2 and Pb 2+ 3. Co +2 and Pb 2+ 4. Cd +2 and Co +2 005 (part 1 of 1) 10 points If you have 250 mL of a solution that is 0.20 M [Ba 2+ ], how many grams of NaF(s) should you add to reduce the equilibrium concentration [Ba 2+ ] to 0.0001 M? BaF 2 (s) is slightly soluble in water at 25 C, K sp = 4 . 7 × 10 - 6 . Answer in units of g.

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