Answer to Question #191068 in Inorganic Chemistry for Samatan Stephen

Question

Hydrolysis of C7H6Cl2 was carried out by refluxing with excess KOH solution. The resulting solution was acidified with dilute HNO3 and excess AgNO3 added to precipitate the chloride ions as silver Chloride, 0.718g of AgCl was formed from 0.805g of C7H6Cl2. (a) calculate the number of chloride atoms present in each molecules of C7H6Cl2? (b) Suggest an explanation for the result obtained in (a)? (c) Give a possible structure of C7H6Cl2?

Answer 1

a) Percent of Chloride atoms =22.1%

b)So there is 44% Cl in the initial compound but after hydrolysis you found only 22.1% which is just half the value you might expect. That means that 1 of the Cl atoms is attached to a coordination sphere and the other Cl atom is outside the coordination sphere. So the ionic Cl was hydrolyzed.

c)