Co2 is formed as a result of the reaction between CaCo3 and Hcl
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1. When calcium carbonate reacts with hydrochloric acid, carbon dioxide gas is produced. A convenient way of following the reaction is to place a flask containing the reactants on a chemical balance and follow the mass of the apparatus with time. As carbon dioxide escapes from the flask it loses mass.
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When one mole of calcium carbonate (CaCO3) reacts with one mole of hydrochloric acid (HCl), it produces one mole of carbon dioxide (CO2), at S.T.P one mole of carbon dioxide's density is 0.00195g/cm3 and weight of one mole of carbon dioxide is around 44gms so the volume of carbon dioxide corresponds to 22,400cm3.
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