The temperature of these in order to get my results Essay Example for Free

The temperature of these in order to get my results Essay In this investigation I will be using CaCO3 in the form of marble chips, and will be reacting these chips with hydrochloric acid. The equation for this is below. Aim: I am trying to investigate whether or not temperature affects the rate of reaction in an experiment. The experiment which I am doing is how temperature affects the rate of gas being given off when Hydrochloric Acid is added to Calcium Carbonate in the form of marble chips. 2HCL(aq) + CaCO3(s) ? H2O (l)+ CO2(g) + CaCl2(aq) Pre-experimentation Procedures, Assessments, and Predictions. Before starting the experiments, I needed to do my risk assessment, find out some things about the chemicals I was going to be using, and make sure that I was fully prepared to do this task safely and efficiently. Hazards: Procedures: Acid Corrosive, can spit when hot Wear safety goggles at all times. Bunsen Burner Exposed flames Do not leave hair untied or let loose clothing flap The Collision Theory I predict that the hotter the acid is, then the faster the rate of reaction will be. I can back this prediction up by stating the Collision Theory, and the Maxwell Boltzmann Distribution theory. When two chemicals react, their molecules have to collide with each other with sufficient energy for the reaction to take place. This is collision theory. The two molecules will only react if they have enough energy. By heating the mixture, you will raise the energy levels of the molecules involved in the reaction. Increasing temperature means the molecules move faster. This is kinetic theory. Preliminary Work and Experiments. In the preliminary work, I was aiming to deduce what the amounts of each chemical should be. I conducted some results using more or less calcium carbonate and each time I took readings every 5 seconds in order to determine how quickly the gas was being given off. I always added the marble chips to 20cm3 of Hydrochloric Acid. To begin with, I used 1. 5 grams of calcium carbonate, and conducted the experiment at room temperature. The experiment was over in 40 seconds, which is too quick. I then tried 1g of marble chips, which took 75 seconds to complete, which is better, yet still too slow. The next day, I decided to try the experiment with 1. 25g. This should have been somewhere between the two speeds of the others, but unfortunately the room temperature was several degrees higher than the day before, and therefore it actually accelerated the experiment. Although this was a setback to getting some useable results, it did show me that because the temperature was higher, the experiment was faster; therefore it was very useful for this experiment. To make sure I had a fair test, I had to do a control. This was at room temperature, whatever that was on the day. Then, I would vary the temperature to see my results. I am going to see how fast the CO2 is given off when I vary the amount of marble chips, therefore I can get the right amount for when I do the full experiment. I set up the apparatus, as shown below, and began the experiment. Here are my first results, please note that the 1. 25g section in italics was the set of results on the hotter day. Amount of gas given off (cm3) Time (s) 1I am going to use temperature as my variable, these experiments were very useful at indicating that my prediction was right. They showed that on the hotter day, even though it had less reactant, the 1. 25g experiment was faster than the 1. 5g one. They also showed that the cold experiment took the longest to complete, which concurs with my prediction. Plan When I do the experiment, I am going to use 1. 25g of calcium carbonate, and 20cm3of Hydrochloric Acid as fixed amounts; I will then vary the temperature of these in order to get my results. To keep the temperature the same both times, and in order to vary it, I will be using an ice bath to keep it cool, and a hot water bath to keep it warm. The calcium carbonate will be measured on a set of sensitive digital scales and the acid will be measured in a measuring cylinder for maximum accuracy.