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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.
Name a metal carbonate which is soluble in water.
What is the common name of NaHCO3?
Chemical formula of washing soda is ______.
Sodium hydrogencarbonate is ______ soda whereas sodium carbonate is ______ soda.
Explain why an aqueous solution of sodium chloride is neutral but an aqueous solution of sodium carbonate is basic (or alkaline). Write chemical equations of the reactions involved.
Name a sodium compound which is used for making borax and glass.
Describe how washing soda is produced starting from sodium chloride (common salt). Write equations of all the reactions involved.
State whether an aqueous solution of washing soda is acidic or alkaline. Give reason for your answer.
Write the name and formula of one salt which contains:
Ten molecules of water of crystallisation.
The number of molecules of water of crystallization in washing soda is ______.
Write the chemical formula.
Washing soda
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?
Correct the mistakes:
- Washing soda is used for making cakes and bread soft, spongy.
- Calcium sulphate hemihydrate is used in textile industry for bleaching cloths.
The name of the salt used to remove permanent hardness of water is ______.
