Notebook Theme

Experiment No. N

Analysis of Copper(II) Bromide (Cu(Br)₂)

Aim

To determine the presence of anion and cation in the given salt

Preliminary Test

  • Odor: Odorless
  • Texture: Crystalline
  • Color: White
  • Solubility: Soluble in water

Test of Anion

ExperimentObservationInference
Take 0.1 g of salt in a test tube and add conc. H₂SO₄ (or add MnO₂ if needed) and warmReddish brown fumes of bromine are evolvedBr⁻ may be present
Confirmatory Tests
Layer Test
Take 1 mL of neutralized extract, add CCl₄/CHCl₃ (or other suitable organic solvent), then add chlorine water dropwise and shake vigorously
Orange-brown colouration appears in the organic layerBr⁻ is confirmed
Silver Nitrate Test
Acidify sodium carbonate extract with dilute HNO₃ (or use water extract) and add AgNO₃
Pale yellow precipitateBr⁻ is confirmed

Test of Cation

ExperimentObservationInference
Original solution + H₂S gas in presence of dil. HClBlack precipitate of Group-II A is formedGroup-II cation may be present
Confirmatory Test
Potassium Ferrocyanide Test
Dissolve the black precipitate in dilute nitric acid, boil the filtrate and then add potassium ferrocyanide
Chocolate brown precipitatePresence of Cu²⁺ is confirmed

Result

The given salt contains Cu²⁺ ions as cation and Br⁻ ions as anion. The salt is Cu(Br)₂.

Precautions

  1. Handle the chemicals with care.
  2. Don't use excess of chemicals.
  3. Keep the mouth of the test tube away from the face.