Preparing a nitrating solution from 100% nitric acid and phosphorous pentoxide. 

Just a few short notes: the 98-100% nitric acid (first pics) is a quite strong oxidizer. If I would spill it on my gloves it would ignite it in no time. Same would happen if I would spill it on my labcoat. 

On the second pics the prepared nitrating mixture is seen. It is a bit like honey, especially when it’s cold. The only difference that it releases toxic fumes (as seen) and if I would like to taste it it would cause very-very serious burns

From the reaction of pure nitric acid and phosphorous pentoxide, nitrogen pentoxide is generated what is also known as the anhydrous form of nitric acid: N2O5 + H2O = 2 HNO3.

The dinitrogen pentoxide is a highly reactive white powder, melting at 41 °C. When it contacts with water, even with the humidity of the air, it produces nitric acid what is quite corrosive. However, it is a great reagent if you would like to prepare a nitrate ester of any compound what you found on the schelf. 

Just for fun: the reason why not to fill fire extinguishers with nitrous oxide instead of carbon dioxide. 

We ignited a small amount (few cm3) of toluene on a piece of aluminium foil and blew nitrous oxide on it. The results were great, as seen on the picture. 

Since the nitrous oxide acts as an oxidizer (it is used in rockets also) it helps the toluene to burn really-really fast.