Fall, 2012 - Dixon
Homework Set 2
Chapter Problems Date to finish
Set 2.1 Oct. 17
Ch. 6 19, 21, 23, 24, 33, 36, 43, 44, 48
Ch. 7 1,
3, 4, 9,
12 (last problem postponed to Set 2.2)
Additional Problem 2.1.
SrCO3 is a sparingly soluble salt. Using the Ksp from the appendix,
a) Determine the concentrations Sr2+ and CO32- when SrCO3 is dissolved in pure water ignoring secondary reactions of Sr2+ and CO32- and ignoring the activity from dissolved Sr2+ and CO32-.
b) Using the concentrations of Sr2+ and CO32- found in a), determine the ionic strength of the solution, the activity coefficients of Sr2+ and CO32-, and account for these in a recalculated concentration of Sr2+ and CO32- (only one iteration of this calculated is expected). Continue to ignore reactions of Sr2+ and CO32-.
Ch. 8 3
Ch. 17 1, 3, 4, 11, 16
Additional Problem 2.2
Using the systematic method and information in the Appendices F and J (note that log value is given in Appendix J), determine [SCN-], [Hg2+], and [HgSCN+] at equilibrium when Hg(SCN)2(s) is dissolved in water. Be sure to show all steps using the systematic method. Neglect activity and assume that neither Hg2+ nor SCN- react significantly with water (no formation of HgOH+ or HSCN). Hint: you will probably want to make an assumption in the charge balance to simplify the problem and then test to see if the assumption is valid.
Set 2.3 Nov.
12 7 (no quiz)
Ch. 22 7a, 17, 19, 22, 28a-f, 30, 38
Ch. 8 6,
8, 11, 19, 21 (postponed to Set 3.1)
No Additional Problem