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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, (Ca2+) or magnesium ions (Mg2+).
Hard water on reaction with sodium carbonate (Na2CO3) forms calcium carbonate or magnesium carbonate precipitate. This precipitate can be filtered out and soft water is obtained.

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