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Reaction Between Hydrochloric Acid And Calcium Carbonate

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AIM To design an investigation to study the kinetics of a reaction of your choice RESEARCH QUESTION With respect to hydrochloric acid (HCl), what is the order of reaction in the reaction between HCl and calcium carbonate (CaCO3) determined by changing the concentration of HCl and measuring the volume of carbon dioxide gas (CO2) collected in 30 seconds whilst keeping the mass of the powdered CaCO3 constant and the temperature of the reaction system at 25oC? BACKGROUND INFORMATION Calcium carbonate (CaCO3) is a chemical compound that is commonly found in rocks such as chalk, limestone, marble and travertine in all parts of the world. It also used as a form of medicine as a dietary supplement for a person with insufficient calcium intake because calcium is needed by the body for healthy bones, muscles, nervous system, and heart. CaCO3 is also used as an antacid to relieve …show more content…

The CO2 gas produced can be used as an indicator for the rate of reaction as the amount of CO2 gas that is collected with in a fixed time is proportional to the rate of reaction. Therefore, the average rate of reaction can be calculated by measuring the amount of CO2 collected for a set period of time. The rate expression of the reaction is written as: rate = k[CaCO3]a[HCl]b 1 http://www.nlm.nih.gov/medlineplus/druginfo/meds/a601032.html 2 http://www.thechemicalblog.co.uk/10-uses-of-hydrochloric-acid/ Page 2 of 7 k represents the rate constant, a and b signify the order of reaction with respect to the reactants. The order of the reaction is the power to which the concentration of that reactant is raised to, for example, doubling the concentration of a reactant that is first order would double the rate of reaction while doubling the concentration of a reactant that is in the second order would quadruple the rate of reaction. TABLE OF VARIABLES Independent Variable Method of measurement Concentration of HCl

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