Prelaboratory Questions And Problems

*1. The reaction responsible for the production of acidity during the acid mine drainage process of oxidation of pyrite by dioxygen can also be written as:

Find the smallest integer values for a, b, c, d, and e so as to balance this equation.

*2. Calculate the acid-producing potential of pyrite, defined as the number of millimoles of protons theoretically produced by 100 g of a pure pyrite sample (see Horan, 2005), based on the overall reaction found in Problem 1.

*3. Calculate the pH of a 0.1 M solution of Fe2(S04)3.

*4. Calcium carbonate is sometimes used for neutralizing acid mine drainage. Calculate the neutralizing capacity of 100 g of CaC03, in terms of the millimoles of H+ that this amount can theoretically neutralize (see Horan, 2005). 5. Explain the difference between mineral acidity and proton acidity in an AMD.

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