## Wikipedia - Condicions estàndard (química) (ca) Wikipedia - Keadaan standar (id) Wikipedia - Standard state (en) Wikipedia - حالة قياسية (ar) Wikipedia - محلول قياسي (ar) Wikipedia - 标准状态 (zh) standard solution

Also contains definitions of: primary standard, secondary standard
https://doi.org/10.1351/goldbook.S05924
A solution of accurately known concentration, prepared using standard substances in one of several ways. A primary standard is a substance of known high purity which may be dissolved in a known volume of solvent to give a primary standard solution. If @S06026@ is used to establish the strength of a @T06386@, it is called a secondary standard solution. The term secondary standard can also be applied to a substance whose active agent contents have been found by comparison against a primary standard. Concentrations of standard solutions may be expressed in $$\text{kmol m}^{-3}$$, $$\text{mol dm}^{-3}$$, or in terms more closely related to those used in specific titrations (as titres).
Source:
Orange Book, 2nd ed., p. 48 [Terms] [Book]