Normal (chemistry)

In organic chemistry nomenclature

Normal alkane: A straight-chain alkane. For instance, normal pentane is the straight-chain pentane. Also written by prefix $n$, for instance, $n$-pentane.

The term is used more generally for organic compounds, as a prefix denoting a straight-chain structure, with functional groups at one end.

In stoichiometry

Normal solution: An aqueous solution that contains one gram-equivalent of the active reagent in 1 liter of solution.

Normality of an aqueous solution: Number of gram equivalents of the active reagent contained in 1 liter of solution.