Question

How to calculate normality of acid by specific gravity?

Answer 1

Normality Calculation Based on Concentration

For calculation of Normality in Liquid (Acids) is Based on three factors:

1. Specific Gravity of the substance.    
2. Equivalent Weight of the substance.
3. Puirity of the substance.

For eg:  Calculation of Hydrochloric Acid Normality:

Sp. Gravity of HCl   =  1.18; Equivalent weight     =  36.45; Purity of HCl           =  35%

                                            Specific Gravity of HCl   x Purity of HCl x 1000
Normality of HCl     =        _____________________________________
                                           Equivalent weight of HCl  x   100

                                                    1.18   x  35 x  1000
Normality of HCl     =         ______________________
                                            36.45     x  100

                                                    1.18  x 35 x 10
Normality of HCl    =         ________________
                                                   36.45

Normality of HCl    = 11.3 N