Submitted by Chip Nataro / Lafayette College on Tue, 01/22/2013 - 13:19
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Research

Does anyone have any experience generating small quantitites of anhydrous HBr? NaBr and ortho-phosphoric acid did not seem to work overly well. At least I don't seem to be generating much of the gas. I have used NaCl and H2SO4 to generate HCl in the past and that is a very rapid and vigorous reaction.

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synthesis
Clifford Rossiter / SUNY Potsdam

Good Day Chip,

 

Reacting sulfuric acid with NaBr typically yields a combination of HBr and Br2. In order to generate gaseous HBr, either a strong non-oxidizing acid must be used or a different set of reaction conditions. One possibility to to react PBr3 with water to form HBr. 

PBr3 + 3 H2O -> H3PO3 + 3HBr.

 

Good Luck.

 

Sincerely,

 

Cliff

 

Wed, 01/23/2013 - 09:30 Permalink