Only where a special,quantitative solubility test is given in the individual monograph,and is designated by a test heading,is it a test for purity.

The approximate solubilities of Pharmacopeial and National Formulary substances are indicated by the descriptive terms in the accompanying table.The term “miscible”as used in this Pharmacopeia pertains to a substance that yields a homogeneous mixture when mixed in any proportion with the designated solvent.

Soluble Pharmacopeial and National Formulary articles,when brought into solution,may show traces of physical impurities,such as minute fragments of filter paper,fibers,and other particulate matter,unless limited or excluded by definite tests or other specifications in the individual monographs.