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A water PH 5.5 is dosed with 80 mg/L of alim CT,co3 = 1*10-4 . How...

A water PH 5.5 is dosed with 80 mg/L of alim CT,co3 = 1*10-4 . How much hydrate lime ,Ca(OH)2 is needed that the PH does not change during coagulation ?

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