Chemistry: molar solubility, hydroxide concentrations, ph level
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The Ksp of La(IO3)3 is 1.0×10-11. Using activities, what is the molar solubility of La(IO3)3 in a 0.050 M solution of NaNO3?
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Solution Summary
Molar solubility, hydroxide concentrations and ph levels in chemistry are examined. The activities are given.
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The Ksp of La(IO3)3 is 1.0×10-11. Using activities, what is the molar solubility of La(IO3)3 in a 0.050 M solution of NaNO3?
The dissociation equation for La(IO3)3 is:
La(IO3)3 La3+ + 3IO3-
Initial concn ------- 0 0
Change s 3s
Equilibrium concn s 3s
Note = s is the concentration of saturated solution, hence the molar solubility
Ksp = a La3+(a IO3-)3 where a = activity = [X]
= activity coefficient
[X] = concentration of species
Ksp = La3+[ La3+]( IO3-[ IO3-])3
Ksp = La3+ (s) (IO3-)3 (3s)3
Ksp = 1 x 10-11 = 27s4 (La3+) (IO3-)3
To solve for activity coefficient ():
• calculate ionic strength (µ)
µ = ½ miZi2
NaNO3 Na+ + NO3-
0.05 M 0.05 0.05
µ = ½ [(0.05)(1)2 + ...
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