Elemental Phosphorus
- not found free in nature - too easily oxidized
Ca3 (PO4)2 calcium phosphate
Ca5 (PO4)3 F fluoro apatite
Ca5 (PO4)3 OH hydroxy apatite (teeth etc)
Ca5 (PO4)3 Cl chloro apatite
- Isolate phosphorus from these ‘rocks’
by burning with charcoal and sand
2 Ca3 (PO4)2 (l) + 6 SiO2 (s) ? P4O10 (g) + 6 CaSiO3 (l)
P4O10 (g) + 10 C (s) ? P4 + 10 CO (g)