Solubility Homework Set

Solubility Homework Set - Dr.Fus CHEM123 CHEMISTRY123 All...

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Dr. Fus CHEM 123 1 CHEMISTRY 123 SOLUBILITY PROBLEM SET All questions listed below are problems taken from old Chemistry 123 exams given here at The Ohio State University. Read Chapter 17.4 – 17.7 as well as pages 35 – 85 of the Laboratory Manual and complete the following problems. These problems will not be graded or collected, but will be very similar to what you will see on an exam. K sp and Molar Solubility (Section 17.4) 1. The solubility product expression for La 2 (CO 3 ) 3 is K sp = ? 2. The solubility product expression for Zn 3 (PO 4 ) 2 is K sp = ? 3. The solubility product expression for La 2 (CO 3 ) 3 is K sp = ? 4. The solubility product expression for Fe(OH) 3 is K sp = ? 5. Calculate the molar solubility of CrF 3 in water. K sp for CrF 3 is 6.6 x 10 ‐11 . 6. What is the molar solubility for PbCrO 4 ? K sp PbCrO 4 = 2.8 x 10 ‐13 7. The solubility of BaF 2 is 1.3 g/L. What is the solubility product constant? 8. One liter of a saturated solution of silver sulfate contains 4.5 g of Ag 2 SO 4 . Calculate the solubility product constant for Ag 2 SO 4 . 9. The solubility of copper(II) iodate, Cu(IO 3 ) 2 , is 1.3 g/L at 25 o C. Calculate the solubility product constant for copper(II) iodate. 10. Calculate the K sp value for Bi 2 S 3 , which has a solubility of 1.0 x 10 ‐15 mol/L at 25 o C. 11. The solubilty of lead (II) chloride is 1.6 10 ‐2 M. What is the K sp of PbCl 2 ? 12. The solubility of CaCO 3 (limestone) is 9.5 mg in 1800 mL. What is the K sp of CaCO 3 (Formula Weight = 100.1 g/mol)? 13. The K sp for CaF 2 is 3.9 x 10 ‐11 . What is the solubility of CaF 2 in water in grams/liter? 14. The K sp for Sn(OH) 2 is 2.0 x 10 ‐26 . What is the solubility of Sn(OH) 2 in water in grams/liter? 15. What is the solubility of iodide ions in a saturated solution of lead (II) iodide (K sp = 1.4 10 ‐8 )? 16. Which compound is the least soluble (mol/L) in water? (a) CaCO 3 K sp = 2.8 x 10 –9 (b) PbI 2 K sp = 8.7 x 10 –9 ( c ) A g B r K sp = 5.0 x 10 –13 ( d ) F e ( O H ) 2 K sp = 8.0 x 10 –16 ( e ) C o ( O H ) 2 K sp = 1.6 x 10 –15
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Dr. Fus CHEM 123 2 17. Which of the following salts has the highest concentration of silver ion when dissolved in water? A g C l K sp = 1.6 x 10 ‐10 A g 2 CO 3 K sp = 8.1 x 10 ‐12 A g B r K sp = 5.0 x 10 ‐13 18. Which compound is least soluble in water? a) Co(OH) 2 K sp = 1.6 x 10 ‐15 b) Fe(OH) 2 K sp = 8.0 x 10 ‐16 c) AgBr K sp = 5.0 x 10 ‐13 d) CaCO 3 K sp = 2.8 x 10 ‐9 e) PbI 2 K sp = 8.7 x 10 ‐9 Qualitative Analysis Group I (Section 17.7 & Lab Manual pages 35 – 48) 19. An aqueous solution contains the following twelve ions: Zn 2+ , Co 2+ , Pb 2+ , Ni 2+ , Cu 2+ , Sn 2+ , Fe 2+ , Sb 3+ , Al 3+ , Cr 3+ , Bi 3+ , and Ag + and cold dilute HCl is added. What precipitate(s) will form? 20. Why must the dilute HCl added in to the solution in question 19 be cold? 21. Why is it better to use dilute HCl in question 19 dilute rather than use concentrated HCl? 22. In the group I analysis, what is the basis of separation for AgCl(s) and PbCl 2 (s). Why is this separation possible?
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Solubility Homework Set - Dr.Fus CHEM123 CHEMISTRY123 All...

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