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B - siarczan(VI) wapnia CaSO₄
C - fosforan(V) wapnia Ca₃(PO₄)₂
D - węglan wapnia CaCO₃
1) 2Ca + O₂ ---> 2CaO
2) CaO + H₂O -----> Ca(OH)₂
3) Ca(OH)₂ + 2HNO₃ ---> Ca(NO₃)₂ + 2H₂O
lub
Ca(OH)₂ + N₂O₅ ---> Ca(NO₃)₂ + H₂O
4) Ca + Cl₂ ----> CaCl₂
5) Ca + H₂SO₄ -----> CaSO₄ + H₂
6) 6CaO + P₄O₁₀ ----> 2Ca₃(PO₄)₂
7) Ca(OH)₂ + CO₂ ----> CaCO₃ + H₂O