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प्रश्न
Give a scientific explanation.
The hard water of a well becomes soft on adding washing soda to it.
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.
Name the metal whose carbonate is known as washing soda.
What is the common name of (a) NaHCO3 and (b) Na2CO3.10H2O?
Fill in the following blank:
Sodium hydrogen carbonate is .................. soda whereas sodium carbonate is ................. soda.
What is meant by "water of crystallisation" in a substance? Explain with an example.
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.
Write the name and formula of one salt each 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
Answer the following question.
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 ____________.
Chemical formula of washing soda 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 ______.
