(a) If the molar solubility of
Ca3(PO4)2 at 25 oC is
4.53e-08 mol/L, what is the Ksp at this
temperature?
Ksp =
(b) It is found that 8.70e-09 g of Ga(OH)3 dissolves per
100 mL of aqueous solution at 25 oC. Calculate the
solubility-product constant for Ga(OH)3.
Ksp =
(c) The Ksp of Ag2C2O4
at 25 oC is 5.40e-12. What is the molar solubility of
Ag2C2O4?
solubility = mol/L
a)
At equilibrium:
Ca3(PO4)2 <----> 3 Ca2+ + 2 PO43-
3s 2s
Ksp = [Ca2+]^3[PO43-]^2
Ksp = (3s)^3*(2s)^2
Ksp = 108(s)^5
Ksp = 108(4.53*10^-8)^5
Ksp = 2.06*10^-35
Answer: 2.06*10^-35
b)
s = 8.70*10^-9 g / 100 mL
= 8.70*10^-9 g / 0.100 L
= 8.70*10^-8 g / L
Molar mass of Ga(OH)3,
MM = 1*MM(Ga) + 3*MM(O) + 3*MM(H)
= 1*69.72 + 3*16.0 + 3*1.008
= 120.744 g/mol
Molar mass of Ga(OH)3= 120.744 g/mol
s = 8.7*10^-8 g/L
To covert it to mol/L, divide it by molar mass
s = 8.7*10^-8 g/L / 120.744 g/mol
s = 7.205*10^-10 mol/L
At equilibrium:
Ga(OH)3 <----> Ga3+ + 3 OH-
s 3s
Ksp = [Ga3+][OH-]^3
Ksp = (s)*(3s)^3
Ksp = 27(s)^4
Ksp = 27(7.205*10^-10)^4
Ksp = 7.277*10^-36
Answer: 7.28*10^-36
c)
At equilibrium:
Ag2C2O4 <----> 2 Ag+ + C2O42-
2s s
Ksp = [Ag+]^2[C2O42-]
5.4*10^-12=(2s)^2*(s)
5.4*10^-12= 4(s)^3
s = 1.105*10^-4 M
Answer: 1.10*10^-4 M
(a) If the molar solubility of Ca3(PO4)2 at 25 oC is 4.53e-08 mol/L, what is the...
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