Question

One strategy for dealing with the acidification of lakes is periodically to add powdered limestone (CaCO3)...

One strategy for dealing with the acidification of lakes is periodically to add powdered limestone (CaCO3) to them. Calculate the pH of a lake that has more than enough powdered limestone in it to saturate the water with its ions Ca2+ and CO32-. The [CO2] in the lake is 1.2*10-5 mol/L.

Suggestions: Begin with the carbonate systems equations and then add a charge balance equation:

[H+]+2[Ca 2+] = [HCO3 -]+2[CO3 2-]+[OH-] appr. = [HCO3 -]+[OH-]

The preceding holds for pH values that are less than about 10, when you work out the solution check to see whether this was a valid assumption.

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