PROBLEM 3

1
PROBLEM 3

• A shallow pool of rainwater forms on a limestone
  outcrop and persists long enough to reach
  equilibrium with calcite. If the temperature is
  25 C, what is the pH? Assume a m.
• If this is rainwater on an outcrop, then we can
  assume that pCO2 10-3.5 atm. We can apply
  equation (3-44) from Kehew (2001) (note you
  should be able to derive this equation yourself)

2

• Because we are told that we can assume a M, and
  inserting the values of the equilibrium
  constants, we obtain
• pH 8.29