# Rate of Reaction Between Hydrochloric Acid and Calcium Chloride

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Purpose What happens to the speed of a reaction between Calcium Carbonate (CaCO3 1M & 3M) and Hydrochloric acid (HCl) as the temperature is changed and the surface area of the reactant. HCl(aq) + CaCO3(s) → CaCl2(aq) + CO2(g) + H2O(l) is the reaction. Hypothesis Factors affecting the rate of Chemical reactions are varied. The “Rate of Reaction” means how fast is the reaction. In the collision theory reactions can happen when the reactant particles collide successfully but most collisions are not successful. The reason is the particles have different kinetic energy but only a small fraction of has enough energy to break bonds and have chemical change. It can be observed by changing the factors of the reactants. For example: As the temperature is increased the reaction rate will increase. When we increase the temperature of the Hydrochloric acid (HCl) the reaction will be quicker, more gas will be formed in a short amount of time. Because increasing the temperature, the particles move faster the ions have more kinetic energy, causing more collisions. Which will increase the reaction. As the temperature decrease the reaction rate will decrease because the particles have less thermal energy, will travel slower, less collision with other particles as a result of this the reaction rate will be lower. Similarly when the Calcium Carbonate (CaCO3) is broken down into powder the rate of reaction will increase. Because smaller pieces of the same mass of solid have a greater surface area compared to larger pieces of the solid. With this in mind when the Calcium Carbonate (CaCO3) is in solid form, the reaction rate will decrease. Procedure 1. Wear safety goggles 2. Measure Hydrochloric acid (HCl 1M) 20ml pour in a small beaker. 3. Weight 2grams of Calcium Carbonate (powder) on a scale. 4. Fill a bowl with a water form the tap, put the ice in it. 5. Place the