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drcswalker

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  1. OK, underwhelmed by responses, I figured out a crude means of getting the answer in React and treating the mineral as a kinetic reactant with the standard (1-Q/K) approach, using H(+) concentration instead of pH and then setting all relevant initial concentrations (H, K, Al, Si) to be on the order of 1e-9 mmolal in 1 kg of water. Is there a more elegant method?
  2. Dear all, New to the forum and a fairly inexperienced GWB user so forgive my ignorance. I wanted to know how you would calculate the pH and aqueous concentrations of 1 kg of initially pure water in equilibrium with a mineral at 25 deg C? For example, if you place 10 g of K-Feldspar in 1 kg pure water at 25 deg C and left it sufficiently long to reach equilibrium, then the water would have a specific pH and K, Al and Si concentrations as dictated by the log K values and activity corrections in the TDB you used. But how would you set up such a simple problem in GWB which seems to require fixed concentrations/activities as inputs?
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