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Calculate the solubility of MgCO_3 in .10M Mg(NO_3)_2?
The Ksp for MgCO_3=1.1e-10. What is the solubility for MgCO_3 in pure water?
a)1.1e-10M
b)1.1e-8M
c)1.1e-7M
d)1.1e-6M
e)1.1e-5M
*I got e
Re-calculate the solubility of MgCO_3 from above, but now in .010M Mg(NO_3)_2.
a)1.1e-10M
b)1.1e-8M
c)1.1e-7M
d)1.1e-6M
e)1.1e-5M
1 Answer
- hcbiochemLv 75 days ago
Equilibrium: MgCO3(s) <--> Mg2+(aq) + CO32-(aq)
Ksp = [Mg2+] [CO32-] = 1.1X10^-10
Let [Mg2+] = x = [CO32-] = molar solubility. Then,
1.1X10^-10 = x^2
x = 1.05X10^-5 M
e is the best answer
Now in a 0.010 M Mg(NO3)2 solution, [Mg2+] = 0.010 M.
Ksp = 1.1X10^-10 = 0.01 [CO32-]
[CO32-] = 1.1X10^-8 M = solubility
b) is the correct answer.