Name the indicator which can give us an idea of how strong or weak an acid or base is.

7 Which is more basic (or more alkaline): a solution of pH = 8 or a solution of pH = 11? 8 Name the scientist who developed the pH scale. 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? 11 What is the name of the indicator which can be used for testing the pH of a solution?