GCSE Chemistry - Tests for Anions - Carbonate, Sulfate and Halide Ions #65

The video tutorial explains how to test for anions, specifically carbonate, sulphate, and halide ions. The carbonate test involves adding hydrochloric acid to the sample and checking for carbon dioxide production by using lime water. The sulphate test uses barium chloride to form a white precipitate if sulphates are present, after removing impurities with hydrochloric acid. The halide test involves using silver nitrate to form precipitates of different colors depending on the halide present, after removing impurities with nitric acid.

What is the purpose of adding dilute hydrochloric acid in the carbonate ion test?

• To remove impurities

• To produce carbon dioxide gas

• To neutralize the solution

• To form a white precipitate

In the sulphate ion test, what indicates a positive result?

• Change in color

• Formation of a gas

• Formation of a white precipitate

• Solution becomes clear

Why is dilute hydrochloric acid added before barium chloride in the sulphate test?

• To enhance the reaction

• To remove carbonate and sulphite impurities

• To increase the temperature

• To change the color of the solution

What color precipitate indicates the presence of bromide ions in the halide test?

• Yellow

• Cream

• Blue

• White

Which reagent is used in the halide ion test to form a precipitate?

• Silver nitrate

• Barium chloride

• Lime water

• Dilute hydrochloric acid