Chemistry
Distinguish between drying and dehydrating agent.
Acids Bases Salts
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Answer
| Drying Agent | Dehydrating Agent |
|---|---|
| Drying Agents remove moisture from other substances. | Dehydrating Agents remove chemically combined elements of water in the ratio of 2:1 (hydrogen:oxygen) from a compound. |
| Drying Agents are used to dry gases like chlorine, sulphur dioxide and hydrogen chloride. They are also used in dessicators to keep substances dry. | Dehydrating Agents prepare substances such as carbon monoxide and sugar charcoal. |
| They represent a physical change. | They represent a chemical change. |
| Example: Phosphorous pentoxide (P2O5), Calcium Oxide (CaO) | Example: Conc. Sulphuric Acid H2SO4 |
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Related Questions
Give reasons for the following:
(a) Sodium hydrogen sulphate is not an acid, but it dissolves in water to give hydrogen ions according to the equation
NaHSO4 ⇌ H+ + Na+ + SO42-
(b) Anhydrous calcium chloride is used in a desiccator.
Explain clearly how conc. H2SO4 is used as a dehydrating as well as a drying agent.
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(a) Solid NaOH
(b) Solid CaCl2
(c) Solid Na2CO3.10H2O
(d) Conc. Sulphuric acid
(e) Iron (III) Chloride
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(b) How can this impurity be removed?
(c) Name a substance which changes the blue colour of copper sulphate crystals to white.
(d) Name two crystalline substances which do not contain water of crystallisation.