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Phosphonium Bromide, PH4Br

Phosphonium Bromide, PH4Br, was made by Serullas in 1831 from the component gases by direct union. Its dissociation pressure reaches only 1 atmosphere slightly below +38° C. It can also be made by passing phosphine into the most concentrated aqueous hydro- bromic acid, or hydrogen bromide dissolved in phosphoryl chloride, or from phosphine and bromine. It forms colourless cubic crystals which sublime at about +30° C. The heat of formation of the solid from the gases PH3 and HBr is +23 Cals., while that evolved when the initial materials are bromine (liquid), hydrogen and phosphorus (solid) is +44.1 Cals.

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