what is the chemical formula of the oxyacid hypophosphorous acid? This is a topic that many people are looking for. bluevelvetrestaurant.com is a channel providing useful information about learning, life, digital marketing and online courses …. it will help you have an overview and solid multi-faceted knowledge . Today, bluevelvetrestaurant.com would like to introduce to you Hypophosphorus acid preparation. Following along are instructions in the video below:
Recently acquired an interesting chemical sodium hypophosphite. Its the soviets alt of hypo phosphorous phosphorous acid. Which can apparently be used together with iodine instead of red phosphorous to alcohols to the corresponding alkane first we wanted to see if we could prepare the acid from the salt.
So we started by measuring out 100 grams of sodium hypophosphite crystals. These are the dihydrate salt. The theory was to see if we could perform the displacement reaction using a strong mineral acid.
So we measured out 30 mils of concentrated hydrochloric acid. Initially this is half. The molar equivalent.
We placed the salt on a hot plate and then added the acid to the crystal. These seem to dissolve and a much lighter colored solid appeared in the suspension. This is a good sign that sodium chloride is being created and precipitated due to the concentration.
We gave the mixture has good stirs and heated it down a hot plate. We then prepared the further 30 mils of concentrated hydrochloric acid. Which should make up to one mole of hcl per mole of sodium hypophosphite.
We added this to the hot mixture and stirred again you can see that the white crystalline deposit is quite thick and different to the original salt. We stirred the mixture for a few minutes and heated up to around 80 degrees c. Then allowed it to cool right down to nearly zero degrees in order to precipitate as much of the sodium chloride salt as possible on chillin for a few hours.
The salt fell to the bottom of the beaker. Leaving the clear solution. So we set up four vacuum filtration and remove the white salt from the lid wood.
We allowed all the liquid be filtered through and for the salt to become reasonably dry. We ended up with covering 40 grams of sodium chloride as you can see here. Its slightly damp.
But even so according to the stoichiometry of the reaction. We would expect 47 grams to be produced in total. So.
This is not bad at all our bill turret is slightly yellow due to our filter not being totally clean. However it tells us that weve got a lot of hypotheses acid as hypophosphite and hydrogen ions in this solution. So we transferred this into a 250 mil flask to see if we could distill of some of the water.
We added. A small magnetic stir bar. So that we could stir to prevent the mixture from bumping and then used a hot plate to heat.
The mixture with a simple distillation after the set up. We also used a vacuum pump to help drive off the water at a lower temperature. We know that hyper phosphorous acid decomposes temperatures higher than about 100 degrees c to form explosive and toxic phosphine gas.
So we wanted to be very careful about this soon. We saw. Some progress.
Asian preparing and we insulated the flask. Using some value mininum oil to make the distillation. More efficient despite all these measures.
The distillation of water was incredibly float and after an hour. We had only managed to obtain around 10 mils of water distilled at this point. We know it is a white precipitate presumably more sodium chloride forming in the boiling flask so we allowed the mixture to cool at this point and chilled it down again to zero degrees.
Once again to filtered this on a bathroom. And we notice that the lifted was now actually white visible and syrupy. We got a further four grams of sodium chloride from this filtration.
So we figured that we must have a relatively strong hypo phosphorous acid solution by now and heres the filtrate exactly 100 grams in weight and measuring 74. Melts giving a density of. 135 the pure acid has a literature density of 14.
9. So this is looking good so lets first put it to the test by reducing some iodine. We place a small amount in a beaker and added a spatula of solid iodine at room temperatures.
Id say that worked pretty well maybe a bit too well lets now see if the acid can be decomposed by heat. This will also tell us how safe it is to boil or reflux we heated a small amount in a beaker on a hot plate first we got some condensation then very slight boiling. Then tiny explosions.
So weve definitely got some good stuff. Here. And well have a go in a future video that using it to reduce an alcohol in the meantime.
Well leave you with our final experiment. Evaporating the liquid to dryness on a glass petri dish. Enjoy the hotplate is only at about 150 degrees c.
So this is a good warning about the reactivity of this compound huge clouds of white phosphorus pentoxide are generated as the phosphine gas produced spontaneously combusts in air stay tuned you .
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