How to Test Acids and Bases on Turmeric Solutions

How to Test Acids and Bases on Turmeric Solutions

Discover how an everyday spice with unusual properties can help you explore science with your children at home. Commonly used in Asian and Middle-Eastern cuisine, turmeric is also one of a number of naturally occurring substances that can act as an indicator, changing color in response to acidity conditions. Learn how to easily make your own indicator paper from turmeric and use it to test acidic and basic (alkaline) foods and other household substances.


Instructions
1
Mix together about two heaped teaspoons of turmeric powder and about three centimeters depth methylated spirits in a disposable plastic cup. Stir the mixture well, and allow the powder to settle. The liquid should now be colored, and it is this liquid that can act as an indicator.

2
Place a sheet of toilet paper on a disposable plate and carefully pour the yellow indicator liquid onto the toilet paper. You only need to add enough liquid to moisten the paper. Allow the paper to dry.



3.Cut the dyed toilet paper into strips. These will act as your indicator paper strips and can be used to test a variety of household acids and bases.

4
Make a basic or alkaline solution by mixing a teaspoon of bicarbonate of soda with a little water. Determine what color the paper turns in the presence of an alkali by placing a dried strip of the paper on a paper plate and adding a drop of the bicarbonate of soda mixture.

5
Add a few drops of lemon juice to the same strip of paper to reverse the color change. Turmeric indicator turns dark red in the presence of an alkali, but remains yellow in the presence of an acidic or neutral solution.

6
Use further strips of the indicator to look for other household substances that are alkaline. Any alkaline substance turns the paper red. Acidic substances will not change the color of the paper, but can be used to reverse the color change of a strip that has already been used to test for an alkali.



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