What is the name of the indicator which can be used for testing the pH of a solution?

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? 12 What colour will universal indicator show if you add it to the following substances?

(a) potassium hydroxide, pH = 12

(b) sodawater, pH = 5

(c) sulphuric acid, pH = 2

13 A beaker of concentrated hydrochloric acid has a pH of 1. What colour will full range universal indicator tum if it is added to this beaker? Is it a strong or a weak acid?