Reaction Rate Investigation :: GCSE Chemistry Coursework Investigation

Reaction Rate Investigation Planning I am trying to work out the rate of reaction between marble chips (calcium carbonate) and Hydrochloric acid. This will be my plan of how to carry out my investigation. There are many factors, which I could change in this experiment. These are 1) Concentration. An increase in concentration means there are more particles. More particles means there will be more collisions. 2) Surface Area. Breaking the solid into smaller pieces will increase the surface area exposed to the other reactant. 3) Temperature. Increasing the temperature will cause the particles to move faster. When particles move faster, more collisions occur and the collisions are more violent. This should increase the reaction rate. All of these factors will affect the reaction rate, but I have decided to change the concentration of Hydrochloric acid. This will determine the rate of reaction by measuring the amount of Carbon Dioxide given off. As I will only change one factor, I will have to keep other factors constant. These will be: - 1) The temperature 2) The size of the marble chip 3) The same apparatus will be used throughout the experiment I predict that as the concentration of hydrochloric acid increases and it becomes more concentrated, the more Carbon Dioxide will be given off. As the concentration increases the chip will fizz more violently. When the concentration has been doubled, the reaction will have doubled. The reaction rate can be increased if the concentration of the reactant is raised. As there are more particles to react with in a higher concentration of acid, the chance of an effective collision goes up. I have performed similar experiments and have acquired this equation: Calcium + Hydrochloric Calcium + Carbon + Water =============================================== Carbonate Acid Chloride Dioxide The reaction rate is also known as the collision theory. This is when successfully 2 particles collide with each other and give off a successful product. This is as shown below: For my experiment I will use 5 different concentrations of hydrochloric acid. These are: 0.5M 1M 1.5M 2M 2.