1. Problem 1-3, Benjamin (2002) ("1-3" refers to Problem 3 in Chapter 1). Calcium sulfate equilibrium. For part (d), use either of the following criteria for convergence: (1) iterate until the new concentrations are within 1% of the concentrations of the previous iteration, or (2) perform a maximum of five iterations.
2. Problem 1-7, Benjamin (2002). Correcting equilibrium constants for seawater.
3. At the Iron Mountain mine in California,
Nordstrom et al. (2000; Negative pH and extremely acidic mine waters from Iron
Mountain, California, Environmental Science &Technology 34,
254-258) measured negative pH values -- as low as a pH of -3.6.
(a) Estimate the concentration of protons ([H+]) for sample
with a pH of -2.5 (designated
90WA110A in Table 2).
(b) Calculate the activity coefficient for a proton (gH+)
for the sample with the pH of -2.5.
(c) Explain briefly the source of the acidity at Iron Mountain.
Last updated on September 07, 2007 at 10:20 PM by Joe Ryan