Answer to Question #153340 in Inorganic Chemistry for Ariel

Question

What would be observed when

(i) Aqueous silver nitrate is added to potassium bromide solution, followed by aqueous ammonia

(ii) Concentrated sulphuric acid is added to a small amount of solid potassium iodide in a test tube

Answer 1

(i) When aqueous silver nitrate is added to potassium bromide the following reaction takes place:

AgNO3 + KBr = AgBr↓ + KNO3.

Silver bromide is a light yellow precipitate that is formed by this reaction. When ammonia is added, it dissolves and the solution becomes transparent.

(ii) When concentrated sulphuric acid is added to a small amount of solid potassium iodide the following reaction takes place:

KI + H2SO4 = KHSO4 + I2 + H2S + H2O

Iodine formes violet precipitate; hydrogen sulfide is colorless, yet it has a unique smell.