Hey, guys! In this video I’ll show you a couple of interesting reactions with Phosphorus pentabromide
On contact with red phosphorous, liquid bromine sets it on fire, forming such reaction products as Phosphorus tribromide and Phosphorus pentabromide
I’m holding ampoules with these reagents.
The liquid one is Phosphorus tribromide, and Phosphorus pentabromide is a yellow powder, that this video will be about
So, guys, let’s take a look at these beautiful crystals of Phosphorus pentabromide one more time,
before I crack the ampoule to show you interesting reactions with it.
Phosphorus pentabromide, as well as its pentachloride, can’t stand any humidity in the air
that’s why we can see the reagent fume, forming the smallest aerosol particles of Phosphoryl bromide and hydrogen bromide
Adding a few drops of water to it will make this reaction occur in a blink.
Phosphorus pentabromide decomposes above 100 °C to give phosphorus tribromide and bromine.
In this way in the vapor phase is completely dissociated to PBr3 and Br2
I already showed you once a nice interreaction of potassium superoxide with phosphorus pentachloride,
that results in the formation of fireblobs.
But let’s find out, whether the effect will be the same, if potassium superoxide interreacts with phosphorus pentabromide.
Phosphorus pentabromide is soluble in carbon disulfide with the formation of a dark-red solution.
And red phosphorus is insoluble in carbon disulfide.
However, if we add red phosphorus to the phosphorus pentabromide, dissolved in carbon disulfide, the solution will become colorless,
because phosphorus pentabromide turns into phosphorus tribromide,
that represents a transparent liquid.
Carbon disulfide ignites on contact with potassium superoxide,
which makes us expect an interesting reaction between the latter and the solution of phosphorus pentabromide with carbon disulfide.
Well, let’s see what happens, if we add just one drop of our solution to a small pile of potassium superoxide.
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