Chemistry
Differentiate between 'hydrated' & 'anhydrous' crystals. Give the chemical formula of the following hydrated crystals:
(a) Washing soda
(b) Gypsum
(c) Blue vitriol
(d) Epsom salt
(e) Glauber's salt.
State which crystal from (a) to (e) is a pentahydrate.
Water
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Answer
| Hydrated crystals | Anhydrous crystals |
|---|---|
| Hydrated crystals contain definite number of water molecules [as water of crystallisation] in loose chemical combination with the crystal. E.g., CuSO4.5H2O | Anhydrous crystals do not contain any definite number of water molecules in loose chemical combination with the crystal. E.g., KNO3 |
| S. No. | Hydrated crystals | Chemical formula |
|---|---|---|
| (a) | Washing soda | Na2CO3.H2O |
| (b) | Gypsum | CaSO4.2H2O |
| (c) | Blue vitriol | CuSO4.5H2O |
| (d) | Epsom salt | MgSO4.7H2O |
| (e) | Glauber's salt | Na2SO4.10H2O |
Blue vitriol [CuSO4.5H2O] is a pentahydrate.
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