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

Drill: Calculate [H2Q], [HQ-], [Q-2], [H+], & pH of 0. 20 M KHQ Drill: Calculate [H2Q], [HQ-], [Q-2], [H+], & pH of 0.20 M KHQ. Ka1 = 2.0 x 10-4 Ka2 = 8.0 x 10-9

Review Drill & Test

CHM II HW Review PP-25 Complete the attached assignment & turn it in tomorrow

Solubility

The amount of one substance that will dissolve in another Solubility The amount of one substance that will dissolve in another

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

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

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

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

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

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

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

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

Write the equation & equilibrium expression for: Al2(SO4)3

Solubility Calculations

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

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

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

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

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

Drill: Calculate the solubility of M3X4 Ksp for M3X4 = 6.9 x 10-207

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

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

150 mL 0. 010 M KI is added to 100 mL 0. 010 M Pb(NO3)2 150 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?

AP CHM HW Read: Chapter 16 Problem: 13 Page: 463

CHM II HW Read: Chapter 20 Problem: 17 Page: 843

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?

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

Review Drill & Check HW

CHM II HW Review PP-25 Complete the attached assignment & turn it in tomorrow.

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

Common Ion Solubility Calculations

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

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

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

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

AP CHM HW Read: Chapter 16 Problems: 18 Page: 463

CHM II HW Read: Chapter 20 Problems: 19 Page: 844

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

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

Aqueous NaI is added (dropwise) to a solution of 0. 10 M AgNO3(s) & 0 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

Aqueous KCl is added (dropwise) to a solution of 0. 10 M AgNO3 & 0 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

Test on Thursday or Friday

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

Review

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

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

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

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

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

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

Aqueous MgCl2 is added (dropwise) to a solution of 0. 10 M KOH & 0 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

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