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# A student is running a titration in the laboratory to determine the alkalinity (Total, bicarbonate and... A student is running a titration in the laboratory to determine the alkalinity (Total, bicarbonate and carbonate, hydroxide) of a drinking water sample. The initial pH of the sample is 11.6; 0.02N H2SO4 is used as the titrant; and the sample volume subjected to the titration is 100 mL (0.1L). The results of the titrations were as follows: 18.3 (volume of titrant to drop the pH from 11.6 to 8.3) = 10.0 mL; V4.5 (volume of titrant to drop the pH from 8.3 to 4.5) = 8.0 mL. Determine all the alkalinity species expressed in "mg/L as CaCO3. (25 points) Determine the "Approximate Alkalinity" of the water sample above , in mg/L as CaCO3 (10 points).

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