Chapter 10:

Problems: 2, 8, 12, 19, 20

Chapter 11:

Problems: 2, 4, 13, 19

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Note: I will be dropping the lowest score of HWs 1-10. If you are content with your scores for 1-9, #10 is of course optional.
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Notes:

10.19: use the Debye-Hückel limiting law for γ_±

10.20:
(a) this requires an interative approach to the solution, see, e.g., pg. 235 of the text.
(b) you can safely assume that the dissolution of the BaSO₄ does not affect the ionic strength given.