1 normal acid or base (1N)
Biologists are sometimes confused by the non-standard chemical unit of normality N. N refers in general to salts while it's most commonly used in the context of acid and bases.
- 1 M (mol/l) = 1 N for an acid that releases 1 proton* when dissolved in water, e.g. HCL (*monoprotic)
- 1 M (mol/l) = 2 N for an acid that releases 2 protons*, e.g. H2SO4 (*diprotic)
By the way, molarity M is also a non-standard unit. Expressing this explicitly as mol/L or mol/m3 is clearer to reader less used to biological customs.