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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.
Name the metal whose carbonate is known as washing soda.
Sodium hydrogencarbonate is ______ soda whereas sodium carbonate is ______ soda.
State two properties of washing soda.
Write the formula of sodium chloride.
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.
State whether an aqueous solution of washing soda is acidic or alkaline. Give reason for your answer.
What is meant by saying that washing soda has detergent properties?
Write the name and formula of one salt which contains:
Ten molecules of water of crystallisation.
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 ______.
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.
Chemical formula of washing soda is ____________.
