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Question
Give any two uses of common salt (sodium chloride).
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Solution
- Common salt (sodium chloride) is used as a raw material for making a large number of useful chemicals in industry, such as sodium hydroxide (caustic soda), sodium carbonate (washing soda), sodium hydrogencarbonate (baking soda), hydrochloric acid, hydrogen, chlorine, and sodium metal.
- Common salt (sodium chloride) is used in cooking food. It improves the flavour of food. Sodium chloride is required by our body for the functioning of the nervous system, the movement of muscles, and the production of hydrochloric acid in the stomach for the digestion of food.
- Common salt (sodium chloride) is used as a preservative in pickles and in curing meat and fish (preserving meat and fish).
- Common salt (sodium chloride) is used in the manufacture of soap.
- Common salt (sodium chloride) is used to melt ice which collects on the roads during winter in cold countries.
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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 | |
How many grams of Magnesium Sulphate are present in 135g of solid left by evaporation of sea water?
You are provided with the list of chemicals mentioned below in the box:
| Sodium hydroxide solution, copper carbonate, zinc, hydrochloric acid, copper, dilute sulphuric acid, chlorine, iron |
Using suitable chemicals from the list given, write a balanced chemical equation for the preparation of the salt mentioned below:
Copper sulphate
You are provided with the list of chemicals mentioned below in the box:
| Sodium hydroxide solution, copper carbonate, zinc, hydrochloric acid, copper, dilute sulphuric acid, chlorine, iron |
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Sodium zincate
Select the correct answer from A, B, C, D and E.
A compound which in the aqueous solution state, is neutral in nature.
