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Drill:

Drill:. Determine the KQ/HQ ratio to make a buffer solution with a pH of 4.70 K a for HQ = 3.0 x 10 -5. Drill: Calculate [H 2 Q], [HQ - ], [Q -2 ], [H + ], & pH of 0.20 M KHQ. Ka 1 = 2.0 x 10 -4 Ka 2 = 8.0 x 10 -9. Solubility. Solubility.

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Drill:

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  1. Drill: • Determine the KQ/HQ ratio to make a buffer solution with a pH of 4.70 • Ka for HQ = 3.0 x 10-5

  2. Drill: Calculate [H2Q], [HQ-], [Q-2], [H+], & pH of 0.20 M KHQ.Ka1 = 2.0 x 10-4Ka2 = 8.0 x 10-9

  3. Solubility

  4. Solubility • The amount of one substance that will dissolve in another

  5. Precipitation • When dissolved particles join together forming a new phase and exit the solution

  6. Precipitate (ppt) • The new phase that forms and leaves the solution

  7. Ppt Examples • Water vapor combining to form rain • Dissolved ions combining to form a solid

  8. Saturated Solution • When the maximum amount of one substance is dissolved in another

  9. Precipitation • When more than the maximum amount of solute is added to a solution, a ppt will form

  10. Write the equilibrium expression for AgCl(s) Ag+ + Cl-

  11. Solubility Product MX(s) M+(aq) + X-(aq) Ksp =[M+][X-]

  12. Solubility Product MX2(s) M+2(aq) + 2 X-(aq) Ksp =[M+2][X-]2

  13. Drill: Write the equilibrium expression for: Al2(SO4)3

  14. Drill: Write the reaction & equilibrium expression when solid Fe2(SO4)3 is added to water.

  15. Solubility Calculations

  16. Calculate the solubility of BaSO4(s) • Ksp = 1.2 x 10-10

  17. Solubility Product BaSO4(s) Ba+2(aq) + SO4-2(aq) Ksp =[Ba+2][SO4-2]

  18. Calculate the solubility of SrCr2O7(s) • Ksp = 2.5 x 10-13

  19. Calculate the solubility of PbI2(s) • Ksp = 8.0 x 10-9

  20. Calculate the solubility of Mn2S3(s) • Ksp = 1 x 10-98

  21. Drill: Calculate the solubility of M3X4Ksp for M3X4= 6.9 x 10-207

  22. Solubility Concepts AgI(s) Ag+ + I- Ksp = [Ag+][I-] at Eq. Qsp = [Ag+][I-] init.

  23. Solubility Concepts • If Qsp > Ksp a precipitate will form • If Qsp < Ksp no precipitate will form

  24. 150 mL 0.010 M KI is added to 100 mL 0.010 M Pb(NO3)2. Ksp for PbI2 = 8.0 x 10-9 • Will a ppt form?

  25. AP CHM HW • Read: Chapter 16 • Problem: 13 • Page: 463

  26. CHM II HW • Read: Chapter 20 • Problem: 17 • Page: 843

  27. Drill: • 10.0 mL 0.050 M KCl is added to 15 mL 0.075 M Pb(NO3)2. Ksp = 1.7 x 10-5 • Will a ppt form?

  28. Drill: Calculate the solubility of AgI(s) • Ksp = 1.5 x 10-16

  29. Common Ion Solubility Calculations

  30. Calculate the solubility of AgI(s) in 0.10 M NaI • Ksp = 1.5 x 10-16

  31. Common Ion Effect • Solubility of a solid is reduced when one of its ions is already in solution

  32. Calculate the solubility of MZ2(s) in • 0.20 M M(NO3)2 Ksp = 2.0 x 10-15

  33. Calculate the solubility of M2Z3(s) in • 0.20 M M(NO3)3 Ksp = 2.0 x 10-16

  34. AP CHM HW • Read: Chapter 16 • Problems: 18 • Page: 463

  35. CHM II HW • Read: Chapter 20 • Problems: 19 • Page: 844

  36. Drill: Calculate the solubility of CaCO3 in water. Ksp = 4.9 x 10-15

  37. Calculate the solubility of PbI2(s) in 0.010 M NaI • Ksp = 3.2 x 10-8

  38. Aqueous NaI is added (dropwise) to a solution of 0.10 M AgNO3(s) & 0.10 M CuNO3 AgI Ksp = 1.0 x 10-16 CuI Ksp = 5.1 x 10-12

  39. Aqueous KCl is added (dropwise) to a solution of 0.10 M AgNO3 & 0.10 M Cu(NO3)2 • AgCl Ksp = 1.8 x 10-10 • CuCl2 Ksp = 5.1 x 10-12

  40. Test on Thursday or Friday

  41. Drill: Calculate the solubility of PbS(s) Ksp = 1.0 x 10-28

  42. Review

  43. Calculate the solubility of PbCl2(s) • Ksp = 1.6 x 10-5

  44. Calculate the solubility of Sc(OH)3(s) • Ksp = 2.7 x 10-31

  45. Calculate the pH of Ca(OH)2 in solution. • Ksp = 4.0 x 10-6

  46. Calculate the pH of LiCO3 in soln Ksp = 8.2 x 10-4 Ka1 = 4.4 x 10-7 Ka2 = 4.7 x 10-11

  47. Calculate the solubility of AgI(s) in 0.20 M NaI • Ksp = 1.5 x 10-16

  48. The solubility of MX2(s) is 2.0 x 10-5 M. Calculate itsKsp

  49. Aqueous MgCl2 is added (dropwise) to a solution of 0.10 M KOH& 0.10 M K2SO4 • Mg(OH)2 Ksp = 6.0 x 10-6 • MgSO4 Ksp = 5.6 x 10-5

  50. Drill: • The solubility of YF3 is 2.0 x 10-8. Calculate the value of Ksp.

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