Question

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 acidic drink, another wants basic and third one wants neutral drink. How will Dorji decide which drink is to be served to whom?

Answer 1

In the given situation, Dorji can test the nature of the drinks in two ways.
$\bullet$ He can taste few drops of soft drinks to find out their nature. An acidic drink is sour in taste, a basic drink is bitter in taste, and a neutral drink does not have a particular taste.

$\bullet$ He can also use litmus papers to identify the nature of the drinks. When a drop of the acidic drink is poured on a blue litmus paper, it turns red. Similarly, when a drop of the basic drink is poured on a red litmus paper it turns blue. But, when the neutral drink is poured the colour of both the litmus papers remains unchanged.