The rates of some chemical reactions can be measured by using the apparatus shown. For which reaction is this apparatus suitable? MgCO3 + 2HCl -> MgCl2 + CO2 + H2O Mg + ZnCl2 -> MgCl2 + Zn MgCl2 + 2NaOH -> Mg(OH)2 + 2NaCl MgO + 2HCl -> MgCl2 + H2O ...