In: Chemistry
For a magnesium fluoride, MgF2, Ksp= 6.4x10^-9, calculate the molar solubility in pure water.
Calculate the molar solubility in 0.050 M NaF solution.
Please show step by step instructions, thank you!
MgF2 --------> Mg+2 (aq) + 2F- (aq)
s 2s
Ksp = [Mg+2][F-]2
6.4*10-9 = s*(2s)2
6.4*10-9 = 4s3
s3 = 1.6*10-9
s = 1.17*10-3 M
solubility of mgF2 is 1.17*10-3 M
MgF2 --------> Mg+2 (aq) + 2F- (aq)
s 2s
s 0.05 +2s
Ksp = [Mg+2][F-]2
6.4*10-9 = s*(2s+0.05)2
s = 2.6*10-6 M
solubility of MgF2 in NaF is 2.6*10-6 M