Concept explainers
Interpretation:
Phosphorouspentoxide is a heck of a drying agent but it is unsuitable for drying many liquids or solutions present in
Concept Introduction:
A drying agent is a chemical used to remove water from an organic compound that is in solution. Phosphorous pentoxide, magnesium sulfate, or potassium chloride etc., are used as drying agent.
Drying agentsare usually certain anhydrous salts that combine with water in the product and hold it as water of crystallization.
Answer to Problem 1E
Due to its exothermic nature and difficult to handle, it is unsuitable for drying many solutions present in organic chemistry laboratory.
Explanation of Solution
The molecular formula of Phosphorous pentoxide is
It is quicker and effective than sodium sulfate and magnesium sulfate in absorbing moisture because if dried an organic liquid with anhydrous sodium sulfate or magnesium sulfate alone, it leaves water in the organic liquid, even if it looks dry (not cloudy).
Though
Sulfuric acid and phosphorous pentoxide are both acidic drying agents that are mainly used in desiccators and not in direct contact with the solution since they are very aggressive reagents. Both have a very high capacity. Sulfuric acid forms hydrates while phosphorous pentoxide is ultimately converted into phosphoric acid.
When
This reaction is exothermic in nature as shown below:
Hence, due to its exothermic nature and difficult to handle, it is unsuitable for drying many solutions present in lab.
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