Question 7
Dorji has a few bottles of soft drink in his restaurant. But, unfortunately, these are not labelled. He has to serve the drinks on the demand of customers. One customer wants an acidic drink, another wants basic and third one wants a neutral drink. How will Dorji decide which drink is to be served to whom?

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Solution

Dorji will take red and blue litmus paper and dip it into every bottle of soft drink. The drink in which red litmus paper turns blue is a bottle of basic drink. The drink in which blue litmus paper turns red is a bottle of acidic drink. The drink in which both litmus paper shows no changes in colour is of neutral drink.

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