Question

Describe in one or two sentences how (not what you would do if you knew the identity of the solution) you could experimentally identify the contents of a test tube containing one of the following two solutions using a common aqueous test solution: pb(no3)2 or kno3

Answer 1

Solution :-

Pb(NO3)2 or KNO3 both are soluble salts therefore to determine if the test tube is having the Pb(NO3)2 or KNO3 solution we can use the KI solution and add it to the test tube

if the solution shows the precipitation after adding the KI solution the it confirms the presence of the Pb(NO3)2 in the test tube because PbI2 is the solid formed after the addition of the KI which gives the precipitate.

But if no precipitate is formed after adding the KI solution to the test tube then it confirms the presence of the KNO3 solution because both KI and KNO3 are soluble.