A technician carries out a dilution series on an alkaline solution. At each stage, the solution from the preceding stage is diluted tenfold with water.
| Dilution stage | pH |
|---|---|
| 0 | 13 |
| 1 | 12 |
| 2 | 11 |
| 3 | 10 |
Use the results to predict the pH after dilution stage 4.
Calculate the hydrogen ion concentration, [H+][\text{H}^+][H+], of the solution after dilution stage 4.
Explain whether the solution after dilution stage 4 is acidic, neutral or alkaline.
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.