Concentrations

Molarity
mol/l   (or mmol/ml etc.)

Normality
mol/l of acid or base functional groups

Molality
mol/kg

Mole Fraction
mol of x / total mol

Mass Percentage (% w/w or wt. %)
mass of substance / mass of total

Mass-Volume Percentage  (% w/v)
mass of substance / volume of total
eg. 37% w/v HCl = 37 g of HCl in 100 ml of solution.

Volume-Volume Percentage (% v/v)
volume of substance / volume of total
eg. 20% v/v MeOH = 20 ml of MeOH in 100 ml of solution.
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