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Phosphoric Acid from Burned Phosphorus: the Thermal Process
Burn phosphorus in air and it becomes a white smoke of phosphorus pentoxide. That oxide takes up water and becomes phosphoric acid, giving off heat. This is the thermal process that makes high-purity acid. Burn weighed white phosphorus in a closed chamber, add the white powder to cold water a little at a time, and bottle the acid, usually sold as an 85 % solution.
The picture: our diagram, phosphorus to smoke to acid.
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