On the heat of formation of fluorides

✍ Scribed by Jos W. Richards

• Publisher: Elsevier Science
• Year: 1891
• Tongue: English
• Weight: 454 KB
• Volume: 131
• Category: Article
• ISSN: 0016-0032
• DOI: 10.1016/0016-0032(91)90166-z

✦ Synopsis

Until the heat of formation of some fluorine compound from its dements was known, it was manifestly impossibl e to determine the heat of formation of the fluorides. On the other hand, as soon as the heat of formation of any fluorine compound had been determined, that of any other fluorine compound could be deduced from this by the calorimetric measurement of a double reaction, in which the first compound took part and the second was produced. Many data of this latter kind had been accumulated before the funda. mental datum of the first kind was obtained, for the simple reason that free fluorine is required in order to determine primarily the heat of formation of a fluorine compound, while the double reactions referred to above only investigate the thermal differences Between various fluorine compounds,-and so do not require free fluorine.

Guntz, in I883, ~ published some data which he miscalled "Heats of Formation of Fluoride.. Under this caption he gives the following figures :