Why is it necessary to standardize solutions of #"EDTA"# in complexometric titrations?
Why is it necessary to standardize any primary standard?
In a titration reaction, typically (i) a KNOWN volume of titrant, of (ii) known concentration, is added to an unknown quantity of reactant. Without knowledge of (i) or (ii), the analyst cannot determine molar equivalence.
In other words, you are performing the following reaction:
Is this clear?