2 Chemistry -- Volumetric Analysis

"All standard solutions are not primary standard solutions." Comment the statement.

"All standard solutions are not primary standard solutions." Comment the statement.

No, they are not. A primary standard is a reagent that is extremely pure,stable,has no waters of hydration and has high molecular weight. Lots of standard solutions are only secondary standard solutions because their concentration changes with time or because it is impossible to produce the exact concentration.

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