During water treatment, in which of the following water sample will you add lime?

pH 7

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pH 5

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pH 8

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pH 10

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Solution

The correct option is B
pH 5

During coagulation, which is one of the steps of water treatment, alum is added which decreases the pH. Lime is alkaline in nature. Therefore, lime is added which regulates the pH by increasing it. To the solution having pH 5, which is acidic, lime will be added.

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Similar questions

pH of water at $25^{\circ} C$ is 7. If water is heated to $70^{\circ} C$ .

In an experiment to test the pH of a given sample using pH paper, four students recorded the following observations.

Sample taken pH paper colour turned to

(I) Water Green

(II) Dil. HCl Red

(III) Dil. NaOH Blue

(IV) Dil. acetic acid Orange

Which one will have pH value of 7?

p H

7

p H

p H

2

p H

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