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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?

Last updated date: 22nd Feb 2024
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Hint: The acidic and basic solution has different tastes when consumed. The acidic and basic and neutral solution can be distinguished with help of litmus paper and pH paper.

The given set of solutions is distinguished with the help of taste of solution, litmus paper and $pH$ paper. Dorji can implement any of these tests and can label the solution and serve on the demand of the customers.
Distinguish using $pH$ paper. The $pH$ paper is very useful to determine the acidity or basicity of a solution with exact $pH$. The $pH$ range of acid varies from $0 - 7$ and of bases varies from $7 - 14$ . The $pH$ of neutral solution is $7$ . So if the $pH$ of the given drink shows light pink to red colour the drink is acidic. If it shows light blue/green to deep blue colour the drink is basic. If no change in colour is observed the drink is neutral.
Note: Water and blood are neutral solutions. These solutions show a $pH$ of $7$ . The $pH$ of a solution is equal to the measure of hydrogen ion concentration in the solution. It is expressed as a negative logarithm of hydrogen ion concentration. If the concentration of hydrogen ion increases the pH of the solution decreases and vice versa.