Example. How many milliliters of a 0.10-molar NaOH solution
will be required to neutralize 100 mil of 0.75-molar HCl

Solution. The amount of HCl present is

0.100 liter X 0.75 mole liter^{-1} = 0.075 mole HCl

Since each mole of HCI yields one mole of H^{+} upon complete
dissociation, this quantity is also equal to 0.075 equivalent of
HCl. For neutralization, the same number of equivalents of NaOH
are required, 0.075. Again, since one mole of NaOH yields one mole
of OH^{-} upon dissociation, 0.075 equivalent of NaOH equals
0.075 mole. The volume of 0.10-molar NaOH required to produce this
amount is

Just as milliliters are easier to use than liters in most situations
because they replace decimal fractions with whole numbers, so millimoles
(mmole) and milliequivalents (meq) often are more convenient than
moles and equivalents; 1 mole = 1000 millimoles. The previous problem
could be solved using millimoles and milliequivalents as follows: