#PrimaryStandardSubstances: Substances that can be weighed in chemical nitrates do not react with water vapor, carbon dioxide, etc., and the concentrations of the solution produced by them remain unchanged for a long time are called primary standard substances.
Such as: Sodium Carbonate (Na₂CO₃), Oxalic Acid (C₂H₂O₄ .2H₂O), K₂Cr₂O₇
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