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प्रश्न
Give a scientific explanation.
The hard water of a well becomes soft on adding washing soda to it.
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उत्तर
The hardness of hard water is due to the presence of chlorides and sulphates of calcium and magnesium. When washing soda (Na2CO3. 10H2O) is added to the hard water, Na2CO3 reacts with the chlorides and sulphates of calcium and magnesium and converts them to insoluble carbonate salts. This changes the hard water into soft water and thus makes it suitable for use.
\[\ce{MgCl2_{(aq)} + Na2CO3_{(s)} → MgCO3_{(s)} + 2NaCl_{(s)} }\]
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संबंधित प्रश्न
Name the sodium compound which is used for softening hard water.
Give two important uses of washing soda.
Name a metal carbonate which is soluble in water.
Fill in the following blank:
Sodium hydrogen carbonate is .................. soda whereas sodium carbonate is ................. soda.
What is washing soda?
Write the formulae of sodium chloride and sodium carbonate.
What is meant by "water of crystallisation" in a substance? Explain with an example.
Describe how washing soda is produced starting from sodium chloride (common salt). Write equations of all the reactions involved.
What is meant by saying that washing soda has detergent properties?
How many molecules of water of crystallisation (per formula unit) are present in:
washing soda?
The number of molecules of water of crystallization in washing soda is ______.
How is washing soda prepared from sodium carbonate? Give its chemical equation. State the type of this salt. Name the type of hardness of water that can be removed by it?
Na2CO3.10H2O is ____________.
The name of the salt used to remove permanent hardness of water is ______.
