Describe the test for identifying the presence of sulfate ions in an aqueous solution. Include the expected observation.

To test for sulfate ions, add a few drops of barium chloride solution to the aqueous solution. A white precipitate of barium sulfate will form if sulfate ions are present. This answer is anchored to Aqueous ion tests (A-level only).

To test for sulfate ions, add a few drops of barium chloride solution to the aqueous solution. A white precipitate of barium sulfate will form if sulfate ions are present. is the best answer because it directly supports the AQA A-Level Chemistry objective to required practical: carry out test-tube reactions to identify cations and anions. This reasoning is anchored to Aqueous ion tests (A-level only) in Reactions of ions in aqueous solution (A-level only), and it separates required from similar A-Level ideas rather than relying on a vague recall statement. Other options are weaker if they use the wrong evidence, calculation, mechanism, observation, unit, or conclusion for this subtopic.