Advertisements
Advertisements
प्रश्न
Give a scientific explanation.
The hard water of a well becomes soft on adding washing soda to it.
Advertisements
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.
\[\ce{MgCl2_{(aq)} + Na2CO3_{(s)} → MgCO3_{(s)} + 2NaCl_{(s)} }\]
APPEARS IN
संबंधित प्रश्न
Name the sodium compound which is used for softening hard water.
Give two important uses of washing soda.
Chemical formula of washing soda is ______.
What is washing 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.
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?
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.
Na2CO3.10H2O is ____________.
Correct the wrong statement given below:
Magnesium hydroxide is used in whitewashing buildings.
The name of the salt used to remove permanent hardness of water is ______.
