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प्रश्न
How would you show that blue copper sulphate crystals contain water of crystallisation?
उत्तर
When copper sulphate crystals (chemical formula CuSO4.5H2O) are heated strongly, they lose all the water of crystallisation and form anhydrous copper sulphate (CuSO4), which is white. As the blue colour of the crystals disappeared on heating, we can conclude that the colour was due to water of crystallisation. This proves that blue copper sulphate crystals contain water of crystallisation.
CuSO4.5H2O → CuSO4 + 5H2O
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संबंधित प्रश्न
Name three chemicals made from common salt (or sodium chloride).
The products of chlor-alkali process are:
(a) NaCl, Cl2 and H2
(b) H2, Cl2 and NaOH
(c) Cl2, Na2CO3 and H2O
(d) NaOH, Cl2 and HCl
Write the name and formula of one salt each which contains:
two molecules of water of crystallisation
Name a salt whose solubility decreases with temperature.
Taking sodium carbonate as an example, give the meaning of the following terms: Anhydrous.
State what would you observe when :
The salt ferric chloride is exposed to the atmosphere.
Distinguish by a chemical test sodium chloride and sodium sulphite.
Sodium carbonate is a basic salt because it is a salt of a ____________.
Many salts absorb water from the atmosphere. This property is called:
The Salt Story
From: The New Indian Express 9 March 2021
The salt pans in Marakkanam, a port town about 120 km from Chennai are the third largest producer of salt in Tamil Nadu. Separation of salt from water is a laborious process and the salt obtained is used as raw materials for manufacture of various sodium compounds.
One such compound is Sodium hydrogen carbonate, used in baking, as an antacid and in soda acid fire extinguishers.
The table shows the mass of various compounds obtained when 1litre of sea water is evaporated.
| COMPOUND | FORMULA | MASS OF SOLID PRESENT /g |
| Sodium Chloride | NaCl | 28.0 |
| Magnesium Chloride | MgCl2 | 8.0 |
| Magnesium Sulphate | MgSO4 | 6.0 |
| Calcium Sulphate | CaSO4 | 2.0 |
| Calcium Carbonate | CaCO3 | 1.0 |
| TOTAL AMOUNT OF SALT OBTAINED | 45.0 | |
What is the pH of the acid which is used in the formation of common salt?
