2007-07-02 20:27:28 · 3 answers · asked by M 1 in Science & Mathematics ➔ Chemistry
Under what circumstances does Calcium Fluoride react/decompose/disintegrate?
2007-07-02 20:28:09 · update #1
Most natural crystalline forms of Calcium fluoride (such as the minerals fluorite and fluorspar are relatively non-reactive. Calcium fluoride, ground to a fine power, however, becomes hygroscopic (will absorb water from the air).
Calcium fluoride will react with concentrated Sulfuric acid to yield Hydrofluoric acid (HF) and Calcium sulfate (CaSO4).
CaF2 + H2SO4 --> 2 HF + CaSO4
2007-07-08 07:24:40 · answer #1 · answered by Richard 7 · 5⤊ 0⤋
The most common (and used in industry) way to decompose calcium fluoride (fluorite in its natural form), is by adding sulphuric acid at 50 dgrees celsius,
Calcium fluorode will be transfomed into calcium sulphate and fluorhydric acid by the reaction
H2SO4 + CaF2 = CaSO4 + 2 FH
Calcium fluoride, is very stable even at high temperatures, so, it will not dissociate into anything below 640 centigrades...a waste of energy and time..expensive too..
As a matter of curiosity, calcium fluoride., emmits a violet fluorescence in the darkness when heated at 120 centigrades .....just a curiosity...
2007-07-08 03:56:03 · answer #2 · answered by Sehr_Klug 50 6 · 0⤊ 0⤋
Extreme heat or acids.
2007-07-03 11:27:07 · answer #3 · answered by ag_iitkgp 7 · 0⤊ 0⤋