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Natural Indicators

Classify the ...

Question

Classify the following into substances having pH values above and below 7. How do these affect litmus paper ?
(i) Toothpaste

(ii) Vinegar

(iii) Solution of washing soda

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Solution

Toothpaste is slightly basic in nature. It has a pH~8.0. It turns red litmus blue.
Vinegar is acidic in nature. It has a pH~4.0. It turns blue litmus red.

Washing soda solution is basic in nature. It has a pH~9.0. It turns red litmus blue.

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Q. One student examines the properties of the substance in the laboratory. Aqueous solution of this substance converts blue litmus paper into the red. Identify the substance.
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Q. Classify aqueous solutions of the following substances according to their pH into three groups : 7, more than 7, less than 7.
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