MEASURING CONCENTRATIONS
The most commonly used unit for concentration is molarity. Its symbol is M.
Molarity is a measure of the number of moles of solute dissolved per liter of
solution (volume).
molarity(M)=Molality, another fairly common unit for concentration, is a measure of the
number of moles of solute dissolved per kilogram of solvent (mass). Its symbol
is m.
molarity(m)=To help you distinguish between the two, think of molarity as moles of dissolved
solute per liter of solution and think of molality as moles of dissolved solute per
kilogram of solvent.
Another way to measure the concentration of a solute is by dividing the mass of
the solute by the total mass of the solution (solute + solvent):
percent by mass(M)= ×100%