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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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