цепочка превращения : Cao - CaSO4 - Ca(OH)2 - Ca3(PO4)2
2Ca+O2=2CaO
CaO+H2SO4=CaSO4+H2O
CaSO4+Ba(OH)2=BaSO4+Ca(OH)2
3Ca(OH)2+2H3PO4=Ca3(PO4)2+6H2O
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2Ca+O2=2CaO
CaO+H2SO4=CaSO4+H2O
CaSO4+Ba(OH)2=BaSO4+Ca(OH)2
3Ca(OH)2+2H3PO4=Ca3(PO4)2+6H2O