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...
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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
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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
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Solubility
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Solubility•The amount of one substance that will dissolve in another
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Precipitation• When dissolved
particles join together forming a new phase and exit the solution
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Precipitate (ppt)•The new phase that
forms and leaves the solution
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Ppt Examples•Water vapor combining
to form rain
• Dissolved ions combining to form a solid
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Saturated Solution•When the maximum
amount of one substance is dissolved
in another
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Precipitation•When more than the maximum amount of solute is added to a solution, a ppt will
form
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Write the equilibrium expression for
AgCl(s) Ag+ + Cl-
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Solubility Product
MX(s)
M+(aq) + X-
(aq)
Ksp =[M+][X-]
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Solubility Product
MX2(s)
M+2(aq) + 2 X-
(aq)
Ksp =[M+2][X-]2
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Drill: Write the equilibrium
expression for:
Al2(SO4)3
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Drill:Write the reaction &
equilibrium expression when solid Fe2(SO4)3 is
added to water.
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Solubility Calculations
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•Calculate the solubility of
BaSO4(s)
•Ksp = 1.2 x 10-10
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Solubility Product
BaSO4(s)
Ba+2(aq) + SO4
-2(aq)
Ksp =[Ba+2][SO4-2]
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•Calculate the solubility of
SrCr2O7(s)
•Ksp = 2.5 x 10-13
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•Calculate the solubility of
PbI2(s)
•Ksp = 8.0 x 10-9
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•Calculate the solubility of
Mn2S3(s)
•Ksp = 1 x 10-98
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Drill: Calculate the solubility of M3X4
Ksp for M3X4
= 6.9 x 10-207
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Solubility Concepts
AgI(s) Ag+ + I-
Ksp = [Ag+][I-] at Eq.
Qsp = [Ag+][I-] init.
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Solubility Concepts• If Qsp > Ksp a
precipitate will form
• If Qsp < Ksp no precipitate will form
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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?
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AP CHM HW•Read: Chapter 16
•Problem: 13
•Page: 463
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CHM II HW•Read: Chapter 20
•Problem: 17
•Page: 843
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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?
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Drill: Calculate the solubility of AgI(s)
•Ksp = 1.5 x 10-16
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Common Ion Solubility
Calculations
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•Calculate the solubility of AgI(s)
in 0.10 M NaI
•Ksp = 1.5 x 10-16
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Common Ion Effect
•Solubility of a solid is reduced when one of its ions is already
in solution
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•Calculate the solubility of MZ2(s)
in
0.20 M M(NO3)2
Ksp = 2.0 x 10-15
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•Calculate the solubility of M2Z3(s)
in
0.20 M M(NO3)3
Ksp = 2.0 x 10-16
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AP CHM HW•Read: Chapter 16
•Problems: 18
•Page: 463
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CHM II HW•Read: Chapter 20
•Problems: 19
•Page: 844
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Drill: Calculate the solubility of CaCO3 in water. Ksp = 4.9 x 10-15
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•Calculate the solubility of PbI2(s)
in 0.010 M NaI
•Ksp = 3.2 x 10-8
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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
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•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
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Test on Thursday or Friday
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Drill: Calculate the solubility of
PbS(s)
Ksp = 1.0 x 10-28
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Review
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•Calculate the solubility of
PbCl2(s)
•Ksp = 1.6 x 10-5
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•Calculate the solubility of Sc(OH)3(s)
•Ksp = 2.7 x 10-31
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•Calculate the pH of Ca(OH)2 in
solution.
•Ksp = 4.0 x 10-6
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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
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•Calculate the solubility of AgI(s)
in 0.20 M NaI
•Ksp = 1.5 x 10-16
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The solubility of MX2(s) is
2.0 x 10-5 M.
Calculate its Ksp
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•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
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Drill:•The solubility of YF3 is 2.0 x 10-8. Calculate the value of Ksp.