Homework Help: chemistry

Posted by nanbala on Thursday, September 27, 2012 at 9:31am.

100 ml of a raw water sample on titration with 1/50N h2so4 required 12ml of the acid to phenolpthalein end-point and 15.5 ml of the acid to methyl orange end point. determine the type and extent of alkalinity present in the water sample.
please explain me this problem in a very lucid manner. atleast explain the procedure and why?

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