Normality is defined as the number of equivalents per liter of solution, where definition of an equivalent depends on the reaction taking place in the solution. For an acid-base reaction, the equivalent is the mass of acid or base that can furnish or accept exactly 1 mole of proton(H+ ions).
当量浓度
溶液的浓度用1升溶液中所含溶质的克当量数(gram-equivalent number)来表示的叫当量浓度,用N表示。
当量浓度=溶质的克当量数/溶液体积(升)
克当量数=质量/克当量
克当量(gram-equivalent weight)实际上是指物质的基本摩尔单元的摩尔质量。
当量=原子量/化合价, 若原子量采用克原子量时,则当量就成为克当量。
克原子量就是现在常说的原子量。