Phosphorus pentoxide

Phosphorus pentoxide is the common name for phosphorus(V) oxide, P₄O₁₀, a white, strongly hygroscopic solid. It removes water from gases and liquids and serves as a dehydrating reagent.

Phosphorus(V) oxide: An oxide of phosphorus in the +5 oxidation state, commonly represented by the molecular formula P₄O₁₀. This formal name and formula describe the substance called phosphorus pentoxide.
Desiccator: A sealed container that maintains a dry atmosphere around moisture-sensitive samples. Phosphorus pentoxide can serve as the desiccant inside a desiccator.
Phosphorus: A reactive chemical element with atomic number 15 and several allotropes. Phosphorus pentoxide is an oxide of this element in its +5 oxidation state.
Hygroscopy: The ability of a substance to absorb moisture from the surrounding air. This property explains why phosphorus pentoxide must be protected from atmospheric moisture.
Phosphoric acid: A triprotic acid with formula H₃PO₄, widely used in fertilizers and chemical manufacturing. Reaction with water converts phosphorus pentoxide into phosphoric acid.
Gas drying: The removal of water vapor from a gas stream using physical or chemical methods. The oxide is used to dry gases that do not react with it.
Phosphorus oxidation states: The formal charge assignments phosphorus adopts in compounds, including +3 and +5. The +5 state distinguishes this oxide from phosphorus(III) oxide.
Chemical burns: Tissue injuries caused by corrosive chemicals through direct contact or reaction. Contact with the oxide or its hydration products can severely damage skin and eyes.
Dehydrating agent: A substance that removes water from another material through physical or chemical interaction. Phosphorus pentoxide is a particularly powerful chemical example of this broader class.
Organic dehydration: A chemical transformation that removes water from an organic molecule or reaction mixture. Phosphorus pentoxide promotes dehydration reactions in suitable organic compounds.

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