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Primary standard

A primary standard in chemistry is a reliable, readily quantified substance. Features of a primary standard include:

1. High purity
2. Stability (low reactivity)
3. Low hygroscopicity and efflorescence
4. High solubility (if used in titration)
5. High equivalent weight

Some examples of primary standards according to the European Pharmacopoeia 5, ch. 4.2:


  • Skoog and West. Fundamentals of Analytical Chemistry. (3rd ed.) Holt, Rinehart, and Winston, 1976.
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Primary_standard". A list of authors is available in Wikipedia.
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