JSS 3 · Chemistry
Acids, bases and indicators
Practical code SL-J3-X02
Aim: To use litmus paper and universal indicator to tell acids, alkalis and neutral solutions apart.
Apparatus
- Red and blue litmus paper
- Universal indicator
- Six solutions: lemon juice, vinegar, pure water, baking soda solution, soap solution, lime water
Method
- Choose a solution.
- Test it with blue litmus, red litmus and universal indicator.
- Record the colours in your table.
- Use the colour of the universal indicator to decide the pH.
- Say whether each solution is an acid, an alkali or neutral.
Safety: In a real laboratory, wear safety glasses and never taste any solution. Lime water and strong acids can harm the eyes and skin.
1. Choose a solution
| Solution | Blue litmus | Red litmus | Universal | It is |
|---|---|---|---|---|
| Your results will appear here. | ||||
Questions on your practical
Answer these the way BECE Basic Science questions on practicals ask: from what you observed, recorded and worked out.