Halide Ion Tests

• Test for Cl⁻:

  1. add 2cm³ of potassium CHLORIDE to a test tube
  2. add 1 cm³ of nitric acid
  3. add 1cm³ of silver nitrate
  4. OBSERVATION: white ppt. of silver chloride

  Ag⁺ (aq) + Cl⁻ (aq)→ AgCl (s)
• Test for I⁻:

  1. add 2cm³ of potassium IODIDE to a test tube
  2. add 1 cm³ of nitric acid
  3. add 1cm³ of silver nitrate
  4. OBSERVATION: yellow ppt. of silver iodide

  Ag⁺ (aq) + I⁻ (aq)→ AgI (s)
• Test for Br⁻:

  1. add 2cm³ of potassium BROMIDE to a test tube
  2. add 1 cm³ of nitric acid
  3. add 1cm³ of silver nitrate
  4. OBSERVATION: cream ppt. of silver bromide

  Ag⁺ (aq) + Br⁻ (aq)→ AgBr (s)