Hi! I am trying to evaluate the amount of CO2 gas produced from the reaction of CaCO3 and HCl. Theoretically the amount of gas that can be achieved from the 0.1 g of calcite is around 24 cc (T=21 degree and P is 1010 mb). But, the experimental value that I obtained is around 30 cc. I have no idea why there is such a big mismatch. note: I filled a measuring cylinder with water and inverted it above a bigger container filled with water. I collected the gas obtained from the reaction in the measuring cylinder and and noted the reading. Is this method correct? Please help me.