Swirl the conical flask during the titration to ensure the solutions are mixed. To ensure reliability in a titration: Carry out at least two accurate titrations and calculate an average titre.

We can measure the rate of the reaction by measuring how fast the reaction produces carbon dioxide. This requires a conical flask and gas syringe. CaCO 3 + HCl → CaCl 2 + CO 2 + H 2 O.