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Why must the concentration of a titrant be known?
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In titration, the concentration of a titrant must be known because the process relies on adding an exactly measured quantity of a reagent to a sample to determine the amount of a specific constituent.1
Because the titrant reacts with the desired constituent in a definite, known proportion, knowing the concentration allows a chemist to calculate the precise amount of the substance present in the sample once the equivalence pointâthe point at which an exactly equivalent amount of titrant has been addedâis reached. Without a standard solution of known concentration, it would be impossible to perform the stoichiometric calculations required for quantitative chemical analysis to determine the unknown quantity of the constituent.12