Calcium Carbonate + Hydrochloric Acid Calcium Chloride + Water + Carbon Dioxide. CaCO3 + 2HCl CaCl2 + H2O + CO2. The rate of reaction is a measure of how quickly a reaction happens. In this instance, we are timing how long it takes for our reaction to produce 50cm3 of carbon dioxide. For chemists synthesizing chemicals, working out the rate of ...
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