The sodium hydroxide test
The sodium hydroxide test
Sodium hydroxide solution is added to a solution of the unknown salt.
Step-by-step lessons on Edexcel GCSE Chemistry 10.1.2 Tests for cations and for ammonia. Each one builds up to exam-style questions. Nail the core quantitative topics — moles, balancing equations and calculations — early on, since they underpin higher-tier questions across every paper and topic.