Write the reaction equation: C-CO2-H2CO3-CaCO3-CaSO4

1. Combustion of coke.
C + O2 = CO2.
2. Carbonic acid is unstable, so the reaction will be reversible.
H2O + CO2 ⇆ H2CO3.
3. Precipitation of calcium carbonate by carbon dioxide from hydroxide.
Ca (OH) 2 + CO2 = CaCO3 + H2O.
4. Calcium carbonate is easily decomposed by acid.
CaCO3 + H2SO4 = CaSO4 + H2O + CO2.



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