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ICSE Class 8 Answered

Differentiate between hydrous and anhydrous substance
Asked by Chandrashekhar | 18 Sep, 2018, 09:30: PM
answered-by-expert Expert Answer
hydrous substances A hydrous compound (a hydrate) is a chemical compound with water in its structure. For example, hydrated salts have water within their crystals. Hydrates form naturally when ionic compounds are exposed to air and make bonds with water molecules. Specifically, the bond is formed between the cation of the molecule and the water molecule. The water that remains is usually known as water of hydration or water of crystallization. Most hydrates are stable at room temperature. However, some involuntarily surrender water in the atmosphere. These hydrates are known as efflorescent. Example - gypsum, Blue Vitriol, Green Vitriol, Alum etc.
 
Anhydrous substancesAn anhydrous compound (an anhydrate) is a compound with no water in its structure. After water is removed from a hydrate, it becomes an anhydrate. The water molecules are removed by suction or heating the compound to a high temperature. For example, an anhydrous salt has had water driven out from its crystals. An anhydrous compound from a hydrate is generally highly soluble in water, and when dissolved in water it will be a similar color to that of the original hydrate, even if it changed color transforming from the hydrate to the anhydrous compound. Example - Sillica Gel, Quick Lime, 
Answered by Sumit Chakrapani | 19 Sep, 2018, 12:33: AM
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