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प्रश्न
What is meant by "water of crystallisation" in a substance? Explain with an example.
उत्तर
he water molecules that form part of the structure of a crystal of a salt are called water of crystallisation. For example, washing soda crystals (or sodium carbonate crystals) contain 10 molecules of water of crystallisation in one formula unit. It is represented as, Na2CO3.10H2O. It is also called sodium carbonate decahydrate the last part of name coming from ten molecules of water present in the crystal structure.
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संबंधित प्रश्न
Fill in the following blank:
Chemical formula of washing soda is ..................
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.
State two uses each of the following compounds:
Hydrogen
State whether an aqueous solution of washing soda is acidic or alkaline? Give reason for your answer.
Consider the following substances:
NaCl, Ca(OH)2, NaHCO3, NH3, Na2CO3, H2O, Cl2, CO2, CaSO4.2H2O, 2CaSO4.H2O, CaOCl2
Which four substances are utilised in the production of washing soda?
The number of molecules of water of crystallization in washing soda is ______.
Give a scientific explanation.
The hard water of a well becomes soft on adding washing soda to it.
Write the chemical formula.
Washing soda
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.
Correct the wrong statement given below:
Magnesium hydroxide is used in whitewashing buildings.
