Answer to Question #120966 in Inorganic Chemistry for jackson

Question #120966
Calcium hydroxide and calcium sulfate are both used to prepare a saturated solution, S. Both
solids are only sparingly soluble, and the pH of S is found to be 11.6.
(i) Given that the Ksp for calcium hydroxide is 4.0 x 10-5
and the Ksp for calcium sulfate is 2.5 x 10-5 determine the concentration of sulfate ions present in S
1
Expert's answer
2020-06-08T15:40:09-0400

Ca(OH)2 --> Ca2+ + 2OH-;

pOH=14 - pH=14-11.6=2.4;

pOH=-lg[OH-];

[OH-]=10-pOH=10-2.4=0.00398≈4*10^-3 mol/L;


[Ca2+]=[OH-]/2=2*10^-3 mol/L;

[SO42-]=[Ca2+]=2*10^-3

Answer: 2*10^-3




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