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Topic: General question about activity coefficents  (Read 2236 times)

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Offline SuPerJC

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General question about activity coefficents
« on: October 09, 2008, 11:38:10 AM »
Problem 1
Calculate activity coefficients for the following ions at the indicated ionic strengths using the Davies equation:
Ca2+ and Cl-; I = 0.06 M
Al3+ and AlOH2+; I = 0.075 M

Problem 2
What is the activity of water in a solution if the vapor pressure of water above the solution is 80% of the vapor pressure of pure water? If the mole fraction of water in this solution is 0.95, what is the activity coefficient for the water?

Problem 3
What assumptions does Essington make when equating Kdiss with Ksp? Under what conditions would these assumptions not be valid?

I took gen chem 3 years ago  and i have no idea with these questions..

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