2. Prepare red cabbage juice by boiling a piece of red cabbage in water. Use it as an indicator and test the acidic and basic solutions with it. Present your observations in the form of a table.
Answer: The experiment is described below:
Aim: To use red cabbage juice as an indicator to identify acids and bases.
Materials Required: Red cabbage, water, several commonly used solutions.
Procedure:
(i) Prepare red cabbage juice by boiling a piece of red cabbage in water.
(ii) Gather several commonly used solutions.
(iii) Take a few drops of each solution and add them to a little bit of the indicator.
Observation:
The red cabbage juice indicator will change colour to reddish-pink on contact with an acid and it will change colour to green on contact with a base. Find the results below for certain commonly used acids and bases.
| Solution | Colour change of Red Cabbage juice indicator | Conclusion |
| Lemon juice | Reddish-pink | Acid |
| Vinegar | Reddish-pink | Acid |
| Curd | Reddish-pink | Acid |
| Grapes | Reddish-pink | Acid |
| Baking Soda | Green | Base |
“Prepare red cabbage juice by boiling a piece of red cabbage in water. Use it as an indicator and test the acidic and basic solutions with it. Present your observations in the form of a table.” – Solved.
Related Links:
Solution to Extended Learning Question 1
Solution to Extended Learning Question 3
Solution to Extended Learning Question 4
Solution to Activity 4.1
Solution to Activity 4.2
Solution to Activity 4.3
Solution to Activity 4.4
Solution to Chapter 4 Acids, Bases and Salts
