1. Higher Only

In an experiment magnesium hydroxide powder is added in 0.1 g portions to 25 cm³ of dilute hydrochloric acid until the magnesium hydroxide is just in excess.

Universal indicator paper can be used to test the pH of the solution after each addition of magnesium hydroxide.

i) Give the name of an alternative piece of equipment that can be used to measure pH.

(1)

ii) State and explain how the pH changes as the magnesium hydroxide is added to the dilute hydrochloric acid.

(4)