In volumetric analysis, the amount of an unknown substance is determined titrimetrically using the volumes and concentrations of a known compound. In this type of determination, the analyte is taken in a flask and small amount of a titrant with known concentration is slowly added to the analyte with which it reacts in the flask. At the end of the reaction, the volume of the titrant added at the end point gives us an idea about concentration of analyte. When the titrant is not added slowly, the volume of titrant added to reach the end point of the titration is misread and this leads to miscalculation of the concentration of analyte. If the titrant is added is added in large increments, the precision of the data measured is affected, When the small increments are added rather quickly, it becomes difficult to evaluate the end point.
When the titrant is added at a rate faster than the rate of chemical reaction taking place excess titrant is built up in the flask, this results in early detection of end point. When the titrant is added at a rate faster than the detector's endpoint detection time, then the end point detection is delayed leading to overestimation of the results.