Investigating Change in pH
Method
- Place a beaker
- Measure 50cm3 of hydrochloric acid
- Dip a glass rod into the acid and put onto universal indicator paper on a white tile
- Wait 30s and record pH of acid and the colour of the paper
- Wash the glass rod to be used in a repeating step
- Measure 0.3g of calcium hydroxide in a weighing boat
- Add calcium hydroxide to acid and stir until all the hydroxide is dissolved
- Repeat the step of dipping the rod onto the universal indicator paper
- Repeat the experiment until the total mass of 2.4g of calcium hydroxide is added