Answer to Question #339801 in Physical Chemistry for Yashpal uikey

Question

100 ml of raw water sample on titration ith N/50 H2SO4 required 12.4 ml of acid to phenolphthalein end point and 15.2 ml of the acid to methyl orange end point. Determine the types and extent of alkalinity.

Answer 1

The alkalinity of water can be determined by titrating the water sample with Sulphuric acid of known values of pH, volume and concentrations. Based on stoichiometry of the reaction and number of moles of Sulphuric acid needed to reach the end point, the concentration of alkalinity in water is calculated.