Hey guys! You all know about such thing as lead dichloride,
which is a white powder used in manufacturing of some types of white paint.
However, there’s also lead tetrachloride that I’m going to talk about in this video.
lead tetrachloride can be acquired from chloroplumbic acid,
that results from bubbling chlorine in the solution of lead dichloride in hydrochloric acid.
This setup for synthesis chloroplumbic acid,
includes a flask with potassium permanganate
where we will produce chlorine
and then we will feed it into another flask with lead dichloride and hydrochloric acid
So, let’s start our synthesis with adding hydrochloric acid to potassium permanganate
Chlorine that evolves as a result of the reaction flows into the flask with lead dichloride
where it oxidizes lead to oxidation state +4
thus forming chloroplumbic acid.
It is clearly seen by the color change of the contents of the flask.
In about an hour
all of the lead dichloride dissolves in hydrochloric acid
and we get a light brown solution of chloroplumbic acid.
Next step is cooling down the produced chloroplumbic acid and triethylamine solution in hydrochloric acid.
Then we mix cooled-down triethylammonium chloride solution and chloroplumbic acid,
which makes the color change to lemon yellow due to the formation of triethylammonium hexachloroplumbate.
After that we bubble chlorine for another fifteen minutes
and filter out the precipitation
Then we wash the precipitate with isopropanol, followed by ether and dry it in a desiccator
After all these steps are completed,
we get dry gold yellow triethylammonium hexachloroplumbate crystals
To get lead tetrachloride,
we add these crystals portionwise with stirring in concentrated sulfuric acid poured into a sep funnel
A few minutes later lead tetrachloride evolves in the form of yellow oil,
that gathers at the bottom of the sep funnel.
Actually, lead tetrachloride is quite an unstable reagent
which is not surprising at all, since it'is yellow,
and there are very few reactions involving it, but I’ll show you a couple anyway.
Here you can see tiny bubbles forming in this yellow oil.
This indicates lead tetrachloride decomposing into lead dichloride and chlorine under exposure to light.
As well as in the light,
lead tetrachloride decomposes quickly below room temperature,
that’s why the recently formed yellow oil has already gained a whitey shade
and is turning white completely quite fast
Take a close-up look at this process
Lead tetrachloride decomposes rapidly when heated,
forming a cloud of poisonous lead dichloride
The same occurs when lead tetrachloride contacts a hot surface
On contact with water, lead tetrachloride forms brown lead dioxide
Lead dioxide is a strong oxidizer.
Hydrogen sulfide combusts on contact with it.
To make the demonstration of this reaction as visual as possible
I’ll pour liquid hydrogen sulfide out on lead dioxide
So, I thought that lead tetrachloride might react violently with hydrogen sulfide, too,
but nothing remotely close to violent happened
and hydrogen sulfide just boiled away
By the way, the video about liquid hydrogen sulfide will be out soon on this channel,
so don’t forget to subscribe so you don’t miss it! Also, it would be a great help if you become a member of my Patreon, like my most dedicated viewers did. It will help me a lot with the release of new videos
Also, it would be a great help if you become a member of my Patreon, like my most dedicated viewers did.
It will help me a lot with the release of new videos
Well, I hope you liked the synthesis of lead tetrachloride and this video altogether.
Feel free to leave your comments, I will be glad to read them all.
See ya in the next video