An automated analyser measures the percentage of acid molecules that are ionised in two solutions. Both solutions initially have a concentration of 0.50 mol/dm3.
| Solution | Acid molecules ionised (%) |
|---|---|
| X | 100 |
| Y | 4.0 |
Explain which solution contains a weak acid.
Water is added to 100 cm3 of solution Y until the total volume is 1000 cm3.
Calculate the new concentration of solution Y.
Explain whether solution Y contains a weak acid or a strong acid after the dilution.
112 exam-style questions on OCR GCSE Chemistry 3.3 Types of chemical reactions, covering 3.3.1 Oxidation and reduction in terms of oxygen, 3.3.2 Acids, alkalis and neutralisation, 3.3.3 The pH scale and measuring pH, 3.3.4 Oxidation and reduction in terms of electrons, 3.3.5 Dilute and concentrated, weak and strong acids, and 3.3.6 Hydrogen ion concentration and pH. Each one has a worked solution and a mark scheme showing where the marks go.