I am working on a chemistry lab report that revolves around the relationship between coagulant dose and its effectiveness at coagulating orthophosphates in lake water.

One of my theoretical questions is as follows:

Calculate the dose of coagulant in mg·L -1 , if the alkalinity of the water before treatment was 5 mval·L-1 , and its acidity was 0.4 mval·L-1 , and the pH of the treated water after coagulation with AlCl3 must be neutral (pH 7).


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