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प्रश्न
Distinguish by a chemical test sodium hydroxide solution and ammonium hydroxide solution.
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उत्तर १
These salts can be distinguished by using metal cations like calcium. When we add calcium salt to sodium hydroxide and ammonium hydroxide, then a white curdy ppt. is formed only in the case of sodium hydroxide.
उत्तर २
With sodium hydroxide solution Ca(NO3)2 sol. gives a fine, milky white precipitate of Ca(OH)2 which is insoluble in excess of NaOH.
\[\ce{Ca[NO3] + 2NaOH -> \underset{milky white ppt}{2NaNO3} + Ca[OH]2\downarrow}\]
Whereas ammonium hydroxide solution with calcium nitrate solution Ca[NO3]2 has no reaction.
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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 | |
What is the pH of the acid which is used in the formation of common salt?
Acids react with metallic oxides to produce ______.
Salt which is formed by the partial replacement of hydrogen ions of an acid by a metal is called ______.
