Homework Chapter 6
Find [Cu2+] in a solution saturated with Cu4(OH)6(SO4) if [OH-] is fixed at 1.0 x 10-6 M.
Cu4(OH)6(SO4) (s) 4Cu2+ (aq) + 6OH- (aq) + SO42- (aq) Ksp = 2.3 x 10-69
A solution contains 0.0500 M Ca2+ and 0.0300 M Ag+.
Can 99% of Ca2+ be precipitated by sulfate without precipitating Ag+?
(Hint: Ksp values can be located in Appendix F of your textbook)
What will be the concentration of Ca2+ when Ag2SO4 begins to precipitate?
Locate Appendix G in your textbook – here you will find the acid dissociation constants (Ka) for many common weak acids. When multiple values are listed, the first (top) value is the Ka1, under it is Ka2, then Ka3, etc.
Write the Ka3 chemical reaction of phosphoric acid. What is the Ka3 value for this reaction?
Write the Kb2 chemical reaction of sodium carbonate. What is the Kb2 value for this reaction? (Hint: Appendix G only lists acids, so you will need to think about the conjugate acid of carbonate!)