Hydrated cobalt(II) chloride, CoCl2⋅6H2O\text{CoCl}_2 \cdot 6\text{H}_2\text{O}CoCl2⋅6H2O, is a pink solid. Anhydrous cobalt(II) chloride, CoCl2\text{CoCl}_2CoCl2, is a blue solid. Heat energy is required to convert hydrated cobalt(II) chloride to anhydrous cobalt(II) chloride. This is a reversible reaction.
CoCl2⋅6H2O⇌CoCl2+6H2O \text{CoCl}_2 \cdot 6\text{H}_2\text{O} \rightleftharpoons \text{CoCl}_2 + 6\text{H}_2\text{O} CoCl2⋅6H2O⇌CoCl2+6H2ODevise an experiment to show that this is a reversible reaction.
38 exam-style questions on Edexcel GCSE Chemistry 5.2 Reversible reactions and equilibria, covering 5.2.1 Reversible reactions and dynamic equilibrium, 5.2.2 The Haber process, and 5.2.3 Changing the position of a dynamic equilibrium. Each one has a worked solution and a mark scheme showing where the marks go.