Core practical 7 - identify unknown organic liquids and inorganic solids

State the type of organic liquid product that forms for any of the reactions that occur during tests 1 to 4.

Test 1 B produces a 1,2-dibromo compound

Test 2 A produces a ketone/aldehyde/carboxylic acid

Test 3 No reactions

Test 4 C produces a bromoalkane

Write ionic equations for the reactions of X, Y and Z in Part 2, test 2.

CO₃^2– + 2H⁺ → CO₂ + H₂O

Ag⁺ + Br^– → AgBr

Ba²⁺ + SO₄^2– → BaSO₄

2Br^– + Cl₂ → Br₂ + 2Cl^–

Why is nitric acid added in the test for halide ions using silver nitrate?

To destroy/react with any carbonate ions so that a precipitate of silver carbonate does not form.

Safety

• Wear eye protection

• Ethanol is flammable

• Silver nitrate solution is corrosive

• Chlorine water is toxic