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FWIW (not much, IMHO):
Elementary calcium reacts with water at room temperature, according to the following reaction mechanism:
Ca (s) + 2H2O (g) -> Ca(OH)2 (aq) + H2 (g)
This reaction forms calcium hydroxide that dissolves in water as a soda, and hydrogen gas.
Other important calcium reaction mechanisms are erosion reactions. These usually occur when carbon dioxide is present. Under normal conditions calcium carbonate is water insoluble. When carbon dioxide is present carbonic acid is formed, affecting calcium compounds.
The reaction mechanism for carbon weathering is:
H2O + CO2 -> H2CO3 and CaCO3 + H2CO3 -> Ca(HCO3)2
And the total reaction mechanism:
CaCO3 (s) + CO2 (g) + 2H2O (l) -> Ca2+ (aq) + 2 HCO3- (aq)
The product is calcium hydrogen carbonate.