Chemistry - Chemical Equilibrium Question with Solution | TestHub

A primary standard in metrology is a standard that is sufficiently accurate such that it is not calibrated by or subordinate to other standards. Primary standards are defined via other quantities like length, mass and time. Primary standards are used to calibrate other standards referred to as working standards.

Oxalic acid is used as a primary standard for $\mathrm{NaOH}$ standardization.