The reversible reaction between three aqueous substances reached equilibrium.
A(aq)+B(aq)⇌C(aq)\text{A(aq)} + \text{B(aq)} \rightleftharpoons \text{C(aq)}A(aq)+B(aq)⇌C(aq)
A change was made to the mixture. The temperature and total volume did not change.
| Stage | Concentration of B in mol/dm3\text{mol}/\text{dm}^3mol/dm3 | Concentration of C in mol/dm3\text{mol}/\text{dm}^3mol/dm3 |
|---|---|---|
| Before the change | 0.50 | 0.80 |
| Immediately after the change | 0.50 | 0.30 |
| At the new equilibrium | 0.35 | 0.45 |
Use the data in the table to explain what change was made and why the concentration of B then changed as the mixture reached a new equilibrium.
109 exam-style questions on AQA GCSE Chemistry 6.2 Reversible reactions and dynamic equilibrium, covering 6.2.1 Reversible reactions, 6.2.2 Energy changes and reversible reactions, 6.2.3 Equilibrium, 6.2.4 The effect of changing conditions on equilibrium, 6.2.5 The effect of changing concentration, 6.2.6 The effect of temperature changes on equilibrium, and 6.2.7 The effect of pressure changes on equilibrium. Each one has a worked solution and a mark scheme showing where the marks go.