Name the scientist who developed the pH scale.

6 Which is more acidic: a solution of pH = 2 or a solution of pH = 6? 7 Which is more basic (or more alkaline): a solution of pH = 8 or a solution of pH = 11? 9 Name the indicator which can give us an idea of how strong or weak an acid or base is. 10 The pH of soil A is 7.5 while that of soil B is 4.5. Which of the two soils, A or B, should be treated with powdered chalk to adjust its pH and why?