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To make a pH indicator paper from red cabbage, and use it to measure the acidity and alkalinity of various products around the house.
Why Red Cabbage
Red Cabbage contains a pigment molecule called Flavin (anthocyanin). This pigment allows the colour of the extract to change based on the substance pH level.
The products I used to test if they are acid, base or neutral.
The indicator paper of the red cabbage extract, will affect the intensity of colour when it is dipped with a solution of different pH level.
Based on the pH of a solution the colour of the pH strip will change:
~ Acidic- Red or Pink
~ Basic- Green or Yellow
~ Neutral- Purple or Blue
The types of solutions that will be tested.
The colour of indicator paper, after testing.
How is it observed?
It is observed by placing the indicator paper into the solutions and their reaction in changing colours.
The amount of solutions used, size of indicator paper and amount of time dipped into the solution.
1. Boil the leaves of the red cabbage and pour the extract into a bowl.
2. Soak the filter paper into the extract and dry.
3. Cut the indicator paper into strips of 5 cm.
4. Dip the strip into the household products.
5. Record your observations.
After the indicator paper was dipped, the colour changed to pink.
As a final result of this experiment, it has proven my theory, of the reaction in the indicator pigment with both acid and bases. It is shown in Test 2 that orange juice was the strongest and mayonnaise was the weakest acid. Then, dish washing powder was the strongest and milk was the weakest base. Displaying how the red cabbage extract is a good indicator for how acidic or basic household items are. A thing that could have been done to make this experiment more accurate was to soak the strips a little longer before using it in the experiment.