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but will not dehydrate sufficiently to form P₄O₁₀.

Applications

Phosphorus pentoxide is a potent dehydrating agent as indicated by the exothermic nature of its hydrolysis producing phosphoric acid:
:P₄O₁₀ + 6 H₂O -> 4 H₃PO₄   (-177 kJ)

However, its utility for drying is limited somewhat by its tendency to form a protective

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