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Answer:
Volumetric solutions are standardised by the methods procedures described in general chapter 4.2.2. When a volumetric solution is to be used in an assay in which the end-point is determined by an electrochemical process (for example, amperometry or potentiometry), the solution is standardised by the same methodprocedure.
The composition of the medium in which a volumetric solution is standardised should be the same as that in which it is to be used.