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-.



Set 2.2                                                                                                          Oct. 31

Ch. 7                                             12, 19, 21, 23, 27, 28a,b

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