Lesson Plan: Tests for Anions Chemistry • Third Year of Secondary School
This lesson plan includes the objectives, prerequisites, and exclusions of the lesson teaching students how to identify aqueous negative ions based on their reactivity and the color and solubility of their salts.
Objectives
Students will be able to
- describe the test for halide anions using nitric acid and silver nitrate and explain why acid is used,
- identify the colors of the silver halide precipitates,
- write word and symbol equations for the precipitation of halide salts,
- describe the solubilities of silver halide salts in dilute and concentrated ammonia,
- describe the alternative test for halide anions using concentrated sulfuric acid,
- describe the test for the sulfate, sulfite, nitrate, and carbonate anion,
- write ionic equations for the tests for carbonate, halide, and sulfate anions,
- identify the anion in an unknown solution using the tests above.
Prerequisites
Students should already be familiar with
- anions,
- precipitates.
Exclusions
Students will not cover
- tests for cations.
