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If a pOH of 8.3 produces the best results for coagulation settling of a water, how much lime should be added to a water with an alkalinity of 255 mg/L as CaCO3 and pH of 7.5 that will be dosed with alum [Al2(SO4(3 * 18H2)] at 55 mg/L when the water temperature is a) 22 deg C and b) 8 deg C?

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