HEATS OF FORMATION OF THE FLUOBORATES OF LITHIUM, SODIUM AND POTASSIUM.
Abstract
Heats of formation of LiBF4(c) and NaBF4(c) from the constituent fluorides, solid alkali fluoride and boron trifluoride gas, at 110C were measured directly. The heat of formation of KBF4(c) from the constituent fluorides at 25C, based on that of NaBF4(c), was determined by comparing the heats of solution in hydrofluoric acid of the pair, NaBF4(c) + KF(c), with that of the pair KBF4(c) + NaF(c). The following values were obtained: -21.40 plus or minus 0.09 kcal/mole for LiBF4; -32.04 plus or minus 0.12 kcal/mole for NaBF4; -43.13 plus or minus 0.22 kcal/mole for KBF4. With the known values of the heats of formation of BF3(gas), LiF(c), NaF(c) and KF(c), one arrives at the heats of formation of the fluoborates: -439.4 plus or minus 0.7 kcal/mole for LiBF4; -440.6 plus or minus 0.5 kcal/mole for NaBF4; -450.2 plus or minus 0.5 kcal/mole for KBF4.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 03, 1967
- Accession Number
- AD0657786
Entities
People
- C. Hayman
- H. A. Joel
- P. Gross