Normality of a solution determines the concentration of solutes in the solution. It is expressed as number of equivalents per litre. (Normality = gram equivalents/ litres solution). Normality can also be calculated by multiplying molarity with gram equivalent Normality (N) = Molarity(M) x Equivalent (N/M)
Noramlity of HCl
First, determine the equivalent of HCl. An equivalent is the number of moles of hydrogen ions one molecule of an acid will donate or one mole of base will accept.
Equivalent of HCl= 1 (as each molecule of HCl will donate only one mole of hydrogen ion)
For example, let's consider 2M solution of HCl.
Gram equivalent of HCl is 1 Normality (N) = Molarity(M) X Equivalent(N/M) Normality = 2 X 1= 2N
For all solutions which have gram equivalent value of 1, the normality of the solution is always equal to the molarity of the solution.