Investigating How Concentration of Acid Affects the Reaction Between Calcium Carbonate and Hydrochloric Acid

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Investigating How Concentration of Acid Affects the Reaction Between Calcium Carbonate and Hydrochloric Acid Introduction ============ According to the collision theory temperature, concentration, surface area and catalysts all affect rates of reaction as shown in the diagrams below. Increasing any of these should increase the number of collisions and so increase the reaction rate up to an optimum point. Increasing the temperature causes the particles to collide with more energy and more frequently, thereby increasing the reaction rate. Surface area is like concentration in that the greater numbers of particles present means that a useful collision is more likely (collision theory). Catalysts provide a surface area for reactions to take place on and so also increase the chances of a reaction. I will be investigating concentration and how it affects the rate of reaction in the reaction between calcium carbonate and hydrochloric acid. Concentration will be my variable (different mole) and the only thing to be changed each time. Temperature can change easily and is difficult to keep constant and surface area is very difficult to measure and almost impossible with chips of marble. No catalysts were available for use so I could not investigate this leaving me with my choice of concentration as the variable in the reaction below: CaCO + 2HCL à CaCL + H O + CO Calcium Carbonate + Hydrochloric acid à Calcium Chloride + Water + Carbon Dioxide Temperature Surface Area Concentration Catalyst Prediction ========== If a solution (HCL) is made more concentrated it means that there are more particles of reactant colliding between the water molecules, which makes collisions between the reactants (HCL and Calcium carbonate) more likely and so increasing the rate of reaction. From this theory I predict that the higher the concentration, the quicker the rate of reaction will be, shown by the displacement of water. The water will be displaced by the carbon dioxide because in a higher concentration of HCL there will be more HCL acid molecules per set
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