The meaning of the units for N and M
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In chemical analysis, what units do N and M represent respectively?
M should represent the mole unit, while N is not clear.
To find out what N M stands for, check in what context it appears
It should be made clear that the full form denoted in chemical analysis, such as M, can refer to either concentration or mass. The meaning of letters varies in different environments.
M can be mass, molecular weight, etc. N can be moles, etc
M – Molar concentration; N – Equivalent concentration (less commonly used these days). For example, in a 0.1M hydrochloric acid solution, the H+ equivalent concentration is 0.1N； For a 0.1M sulfuric acid solution, the H+ equivalent concentration is: 0.2N.
M is the molar concentration, and N is the equivalent concentration. Equivalent concentration was a commonly used unit in chemistry before 1990.