Anion colours

Question 1

Front (Question)

Answer 1

Back (Answer)

Question 2

What is the test and positive result for carbonate ions (CO₃²⁻)?

Answer 2

Add dilute acid (e.g. HCl). Positive result: Effervescence (CO₂ gas) turns limewater cloudy.

Question 3

What is the test and positive result for sulfate ions (SO₄²⁻)?

Answer 3

Add dilute HCl, then barium chloride solution (BaCl₂). Positive result: White precipitate of barium sulfate.

Question 4

What is the test and positive result for chloride ions (Cl⁻)?

Answer 4

Add dilute nitric acid, then silver nitrate (AgNO₃). Positive result: White precipitate of silver chloride.

Question 5

What is the test and positive result for bromide ions (Br⁻)?

Answer 5

Add dilute nitric acid, then silver nitrate (AgNO₃). Positive result: Cream precipitate of silver bromide.

Question 6

What is the test and positive result for iodide ions (I⁻)?

Answer 6

Add dilute nitric acid, then silver nitrate (AgNO₃). Positive result: Yellow precipitate of silver iodide.