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Permanent Hardness

Rahul took 25...

Question

Rahul took 25 ml of sea water in a beaker and added one spoon of sodium carbonate to it. Which of the following will he observe?

A

Solution colour changes to blue

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B

Precipitate is formed

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C

Bubbles are formed

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D

Solution colour changes to red

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Solution

The correct option is B Precipitate is formed
Sea water is basically hard water. It contains dissolved salts of calcium ions, $({Ca}^{2 +})$ or magnesium ions $({Mg}^{2 +})$ .
Hard water on reaction with sodium carbonate $({Na}_{2} {CO}_{3})$ forms calcium carbonate or magnesium carbonate precipitate. This precipitate can be filtered out and soft water is obtained.

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