When phosphorus burns in an insufficient supply of air the product is partially the trioxide; in oxygen or an excess of air the pentoxide is formed.
The pentoxide is much the better known of the two.
The trichloride, ICl3, results from the action of excess of chlorine on iodine, or from iodic acid and hydrochloric acid, or by heating iodine pentoxidewith phosphorus pentachloride.
This gives the weight of the pentoxide in the sample.
It is a white powder almost insoluble in water and nitric acid, and when heated, is first converted into metantimonic acid, HSbO3, and then into the pentoxide Sb2O5.
Nitric acid oxidizes antimony either to the trioxide Sb4O6 or the pentoxide Sb2O5, the product obtained depending on the temperature and concentration of the acid.
Antimony pentoxide is obtained by repeatedly evaporating antimony with nitric acid and heating the resulting antimonic acid to a temperature not above 275 deg.
Phosphoric acid was therefore regarded by Graham as a compound of pentoxide of phosphorus and water, the latter being as essentially a part of the acid as the former.
The phosphorus pentoxide tube is best made as shown simply from a bit of wide tube, with two side connections fused to the rest of the pump.
The exit tube from the phosphorus pentoxide should be drawn down to form a nozzle, from, say, half an inch to one-eighth of an inch in diameter, so as to easily fit almost any bit of rubber tube.
The apparatus consists of a solid and heavy block of wood supporting a calcium-chloride tube permanently connected with a tube of phosphorus pentoxide divided into compartments by plugs of glass wool.
The phosphorus pentoxide should be pure, or rather free from phosphorus and lower oxides; unless this be the case, the vapour arising from it is apt to soil the mercury in the pump.
The oxyfluoride, CbOF3, results when a mixture of the pentoxide and fluorspar is heated in a current of hydrochloric acid.
Columbium tetroxide, Cb2O4 is obtained as a black powder when the pentoxide is heated to a high temperature in a current of hydrogen.
It burns readily in air, and is converted into thepentoxide when fused with acid potassium sulphate.
Columbium pentafluoride, CbF5, is obtained when the pentoxide is dissolved in hydrofluoric acid.
Columbium pentachloride, CbCl5, is obtained in yellow needles when a mixture of the pentoxide and sugar charcoal is heated in a current of air-free chlorine.
It burns when heated in air, forming the pentoxide and sulphur dioxide.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "pentoxide" in a variety of sentences. We hope that you will now be able to make sentences using this word.
