4P + 5O2 → 2P2O5
P2O5 + 3H2O → 2H3PO4
Ca + 2H3PO4 → Ca(PO4)2 + 3H2↑
Ca + 2HCl → CaCl2 + H2↑
CaCl2 + Na2CO3 → CaCO3↓ + 2NaCl
CaCO3 → CaO + CO2↑
CO2 + K2O → K2CO3
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Verified answer
4P + 5O2 → 2P2O5
P2O5 + 3H2O → 2H3PO4
Ca + 2H3PO4 → Ca(PO4)2 + 3H2↑
Ca + 2HCl → CaCl2 + H2↑
CaCl2 + Na2CO3 → CaCO3↓ + 2NaCl
CaCO3 → CaO + CO2↑
CO2 + K2O → K2CO3