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The following results of alkalinity determination for 100 ml sample titrated with 0.02N H SO. (Answer 8-9) Sample pH=11 Phenolphthalein end point = 10ml Methyl orange end point - 15.5ml 81 Caustig alkalinity in mg/l asCaco. 17.0 0.001 50 200 9) Total alkalinity in mg/l asCaco, 105 230 300 155