Answer to Question #250870 in Physical Chemistry for SHANIB HUSSAIN

Question

100 ml of a sample water on titration with N/50 H2SO4 required 6.8 ml of the acid to Phenolphthalein end point and 13.6 ml of the acid to Methyl orange end point. Determine the type and amount of alkalinity present in the water sample

Answer 1

Total alkalinity is measured by collecting a water sample, and measuring the amount of acid needed to bring the sample to a pH of 4.2. At this pH all the alkaline compounds in the sample are "used up." The result is reported as milligrams per liter (mg/l) of calcium carbonate. and pH less than 5.0.