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Question
Sodium hydroxide is termed an alkali while Ferric hydroxide is not because ______.
Options
Sodium hydroxide is a strong base, while Ferric hydroxide is a weak base.
Sodium hydroxide is a base which is soluble in water while Ferric hydroxide is also a base but it is not soluble in water.
Sodium hydroxide is a strong base while Ferric hydroxide is a strong acid.
Sodium hydroxide and Ferric hydroxide both are strong base but the solubility of sodium hydroxide in water is comparatively higher than that of Ferric hydroxide.
Solution
Sodium hydroxide is termed an alkali while Ferric hydroxide is not because Sodium hydroxide is a base which is soluble in water while Ferric hydroxide is also a base but it is not soluble in water.
Explanation:
The bases that dissolve in water are known as alkalis. While Fe(OH)3 is not soluble in water, NaOH is only weakly so. NaOH is therefore an alkali, whereas Fe(OH)3 is not. All bases are alkalis, but not all alkalis are bases.
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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 saturated solution of Sodium Chloride called?
