Wednesday 2 September 2015

concentration - What does the unit M stand for?



What does $\mathrm{M}$ signify in this pH calculation? To me, it just seems to be a random variable.


For example: $\ce{[H+]} = 1.0\times10^{-7}~\mathrm{M}$


I am not sure what the $\mathrm{M}$ is supposed to mean?




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