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RECEIVED December 9, 1948.
INDICATORS I. 31. KOLTHOFF Unicersity of Minnesota, Minneapolis, .Ifinn.
Q
UITE generally an indicator in chemistry io a substance which
indicates the presence of a certain constituent. I n this sense all the reagents which are used for the detection of a given constituent are indicators. I n a more limited sense an indicator is a substance which indicates the extent to which a reaction between two or more reactants occurs. I n volumetric analysis the
