Question

Dorji has a few bottles of soft drinks 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 a basic one and the third one wants a neutral drink. How will Dorji decide which drink is to be served to whom?

Answer 1

Based on taste :

On the base of taste, Dorji can easily decide as the acidic solution is sour, the basic solution is bitter, and the neutral solution is tasteless.

Litmus paper test :

For acids-

• Acid turns blue colour litmus to red colour.
• To test the acidic solution, he should use blue litmus paper. Dorji must add a drop of solution to the blue litmus paper. If the colour changes to red, the fluid is acidic.

Litmus paper test :

For bases-

• Base turn red colour litmus to blue.
• Add a drop of solution to red litmus paper. If it turns blue, the solution is basic in nature.

Litmus paper test :

For neutral drinks:

If the drinks show no change in colour with litmus, then it will be a neutral drink.