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Question: a water sample at ph 79 has dic 07mm...

Question details

A water sample at pH 7.9 has DIC = 0.7mM, and a measured dissolved Ca2+
concentration of 85 mg/L.
(a) Calculate the equilibrium concentrations of HCO3
- and CO3
2- in the sample.
(b) Calculate the alkalinity of the water (in eqv/L) assuming that the carbonate system
dominates the weak acid-base balance in the water.
(c) Calculate the saturation index for CaCO3(s) in this water sample.
(d) Considering the saturation index, is the water at equilibrium, undersaturated, or
oversaturated with respect to CaCO3(s)? Explain.

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