Atomistry » Carbon » Chemical Properties » Carbon Tetrafluoride
Atomistry »
  Carbon »
    Chemical Properties »
      Carbon Tetrafluoride »

Carbon Tetrafluoride, CF4

Fluorine is the only halogen that will unite readily with carbon. Moissan has shown that in fluorine gas purified lampblack becomes incandescent, and wood-charcoal takes fire spontaneously, but that it is necessary to heat the denser forms of amorphous carbon to 50°-100° C. to induce combination; whilst graphite and gas-carbon react with fluorine only at a red heat, and diamond is unaffected at any temperature.

Carbon tetrafluoride results from the substitution of fluorine for hydrogen or halogen in methane or any of its halogen substitution products, but is best prepared by passing the vapour of carbon tetrachloride over silver fluoride heated in a metallic tube to 195°-200° C. Carbon tetrafluoride is a gas at ordinary temperatures and pressures; it is liquefied at 20° C. under four atmospheres, and at - 15° C. under one atmosphere pressure. It is slightly soluble in water, and very soluble in alcohol and ether; it reacts with the silica of heated glass, thus:

CF4 + SiO2 = CO2 + SiF4,

and with heated sodium forms fluoride with separation of carbon. It is absorbed by alcoholic potash, being gradually converted into a mixture of potassium fluoride and carbonate.

It is noteworthy that no complex acid, H2CF6, analogous to H2SiF6, has been described; and indeed that carbon tetrafluoride, like the tetrachloride, is unacted on by water.

Last articles

Tb in 6TVY
Si in 6Y7O
Rh in 6WRM
Rh in 6WRL
Ni in 6Y8Z
Ni in 6Y8Y
Na in 6ZXZ
Na in 7ACG
Na in 6YLS
Na in 6Y8Z
© Copyright 2008-2020 by
Home   |    Site Map   |    Copyright   |    Contact us   |    Privacy