Question

What is the difference between molarity and normality?

Answer 1

Molarity (M) is defined as the number of moles of solute per litre of solution.
molarity = moles of solute / liters of solution

Normality (N) is another ratio that relates the amount of solute to the total volume of solution.
It is defined as the number of equivalents per litre of solution:
normality = number of equivalents / 1 L of solution

There is a very simple relationship between normality and molarity:
$N=n\times M$ (where n is an integer)

For an acid solution, n is the number of H+ provided by a formula unit of acid.