Hello guys! If someone asked you to demonstrate a chemical reaction with carbon disulfide,
it would probably be either one with white phosphorus or the barking dog reaction.
carbon disulfide
phosphorus
Barking dog
white phosphorus
barking dog
10-foot barking dog
barking dog reaction
Burning phosphorus in carbon disulfide
O, nice! :)
Barking dog reaction in slow motion
Spontaneous combustion of paper in white phosphorus
barking dog reaction
Carbon disulfide is highly toxic and extrmely flammable liquid
It can flare up even while poured in a squirt in hot weather
They say, that carbon disulfide's flame doesn't char paper.
You can see elemental sulfur formed by partial oxidation of carbon disulfide by the oxygen contained in the air.
Carbon disulfide has the widest range of explosion limits.
Even one percent of carbon disulfide contained in the mixture of carbon disulfide and air
is enough to make them explode
Under the influence of carbon disulfide and alkali hydroxides alcohols are transformed to xantogenates,
taht is monoesters of dithiocarbonic acid, which can be recognized by their yellow color.
The presence of xanthogenates can be detected by converting them to the insoluble copper
or to strongly colored complexes with molybdates of the this composition.
I didn't have ammonium molybdate, so I had to prepare it.
The method is very simple. You need to prepare concetrated ammonia solution of Molybdenum trioxide,
then decant and dilute acetone.
Ammonium molybdate is solventless in acetone so it gets precipitated.
This test is positive both for primary and secondary alcohols
Tertiary alcohols give a positive xanthogenate test (they form yellow xanthogenates),
but with the molybdate test is negative,
because xanthogenates of tertiary alcohols hydrolyze under the conditions of the reaction
You know that white phosphorous gets dissolved very well in carbon disulfide,
but so is elemental iodine. Thanks to iodine solution in carbon disulfide it's possible
to demonstrate a reaction with the aqueous solution of sodium azide.
Before we move on I want to show you how decomposition of sodium azide looks like one more time.
The iodine, dissolved in carbon disulfide , reacts with aqueois solution of sodium azide
producing gaseous nitrogen that you can observe in the form of a thousand tiny bubbles.
Here's the same reaction but with the aqueous solution of iodine, just for comparison.
Reaction will not occur until we add a few drops of carbon disulfide
Carbon disulfide is the best solvent for elemental sulfur
Sulfur, dissolved in carbon disulfide,
reacts with copper at room temperature.
Look how a copper spoon gets covered with black tarnish - it's Copper sulfide forming.
You've probably seen sulfur burn in oxygen in a beautiful blue flame,
but a saturated solution of sulfur in carbon disulfide burns much more astonishing.
A bonus dangerous reaction!
sulfur solution in carbon disulfide and chlorine dioxide vapors
I chose this reaction because elemental sulfur reacts with chlorine dioxide on its own.
Chlorine dioxide is a very unstable material,
so the concetration of it should not be high for the experiment.
As you might've noticed, carbon disulfide is capable to do something else
besides reacting white phosphorus and barking dog reaction.
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