when calcium hydroxide reacts with co2 in the air, calcium carbonate is formed along with h2o that gives the shine after a whitewash. so it must be the calcium carbonate that gives the shine, then what happens to the h2o formed during the reaction?
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Your question appears to be incomplete, although I am providing a suitable explanation.
Ca(OH)2 + CO2 gives CaCO3 + H2O
Aqueous calcium hydroxide reacts with carbon dioxide to form a white precipitate of calcium carbonate and hydrogen. This mixture when applied to walls, it dries up within 1-2 days which means water evaporates and CaCO3 hardens as a coating on wall.
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Your question appears to be incomplete, although I am providing a suitable explanation.
Ca(OH)2 + CO2 gives CaCO3 + H2O
Aqueous calcium hydroxide reacts with carbon dioxide to form a white precipitate of calcium carbonate and hydrogen. This mixture when applied to walls, it dries up within 1-2 days which means water evaporates and CaCO3 hardens as a coating on wall.
If your doubt is still unclear, rephrase your question and ask as a separate doubt so that experts can get to it at the earliest.
Regards