Normality refers to the gram equivalent of the substance being dissolved in one liter of the solution. Gram equivalent weight can be defined as the molecule’s reactive capacity. It is measured as ‘N’,eq/L or meq/L where ‘eq’ stands for equivalents while ‘meq’ stands for milliequivalent. Normality is the most preferred form of measuring concentration for titration calculations.
Molarity is the most commonly used measure of concentration in a solution. Molarity may also be referred to as molar concentration. It can be defined as the number of moles of a solute dissolved per litre of solution.
There is a very close relation between molarity and normality. Normality can be described as a multiple of molarity. While Molarity refers to the concentration of a compound or ion in a solution, normality refers to the molar concentration only of the acid component or only of the base component of the solution. Thus, normality offers a more in-depth understanding of the solution’s concentration in acid-base reactions. One of the main differences between the normality and molarity of a solution is that normality describes the amount of gram equivalent of compound present in the solution while molarity describes the number of moles present in the solution.
Knowing the molarity of a solution is key to calculating its normality. The easiest formula to calculate normality is: