(1)
Some solid CaCO3 (calcium carbonate) is in equilibrium with its
saturated solution.  How will the amount of Ca^2+ in the solution be
affected (increase, decrease, or no change) by adding small amounts of
the following:
(a) KOH
(b) CaCl2
(c) HCl
(d) Na2CO3
(e) H2O
(f) by increasing pressure

(2)
    (a) How much Fe^2+ (expressed in mole/liter) could be present in a
10^-2 M NaHCO3 solution without causing precipitation of FeCO3?
        -The solubility product of FeCO3 is k = 10^-10.7
        -The solution is neutral (pH = 7)
        -NaHCO3 is completely dissolved
        -The equilibrium constant of HCO3- = H+ + CO3^2- is k =
10^-8.9
    (b) If the pH of that solution is lowered by 1 unit (pH = 6), how
would
        this maximum soluble Fe^2+ concentration change?