IDENTIFYING NON METAL IONS

Question 1

method for testing for carbonate ions

Answer 1

• add dilute hydrochloric acid to the sample
• the acid will react with the carbonate to produce carbon dioxide gas. We will see fizzing
• bubble the gas through lime water, if it goes cloudy it proves that we have carbon dioxide and therefore have the carbonate ion

Question 2

method for testing for the halide ions

Answer 2

• add dilute NITRIC acid to the sample
• add dilute SILVER NITRATE solution
• halide ions will produce a precipitate of the silver halide (each halide makes a different coloured precipitate)

Question 3

what colour precipitate do chloride ions form

Answer 3

white precipitate of silver chloride

Question 4

what colour precipitate do bromide ions form

Answer 4

cream precipitate of silver bromide

Question 5

what colour precipitate do iodide ions form

Answer 5

yellow precipitate of silver iodide

Question 6

method for testing for the sulfate ions

Answer 6

• add dilute HYDROCHLORIC acid to the sample
• add BARIUM CHLORIDE solution
• if sulfate ions are present we will see a white precipitate