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Factors Affecting Rates Of Reaction.

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Matthew Mckittrick Factors Affecting Rates Of Reaction 10XA, Mr. Butterworth Hypothesis When marble chips are placed in hydrochloric acid, they react to form Calcium chloride + Carbon Dioxide + Water :- Calcium + Hydrochloric Calcium + Carbon + Water Carbonate Acid Chloride Dioxide CaCO3 + 2HCL CaCL2 + CO2 + H2O Reactants Products I intend to investigate the relationship between the strength of the hydrochloric acid and the rate of the reaction. In agreement with "http://www.courseworkhelp.co.uk/GCSE/Science/08.htm" I predict that as molarity (strength) of the acid increases, the speed of the rate of reaction will also increase. Concentration effects the rate of a reaction because the higher the concentration of particles the greater the chance of a successful collision. Based on the collision theory, I think this will happen because, as the strength of the acid increases there are more particles available to react. Also, as the strength of the acid increases, the particles will have more activation energy. ...read more.


To collect the gas I will set up the bowl of water and completely submerge the measuring cylinder, stand it upright in a clamp stand and place the delivery tube from the conical flask to the underneath of the upturned as shown in diagram B. Once the equipment is in place I will measure out 30 ml's of 0.5 molar acid and pour it into a conical flask, then weigh out 25 grams of equally sized (as much as possible) marble chips and add them into the conical flask then inserted the bung. As the reaction is taking place the gas given off (CO2) will travel along the delivery tube and into the upturned measuring cylinder pushing the water down the graduation mark giving me an accurate reading of how much gas has been given off. I will take a reading of the gas given off every 15 seconds as this is most practical for all of the strengths of acid. ...read more.


If I was to do this experiment again I would probably make it more accurate by using a Burette (A burette is a vertical cylindrical piece of laboratory glassware with a volumetric graduation on its full length and a tap on the bottom http://en.wikipedia.org/wiki/Burette) to measure the amount of gas given off, this would measure a lot more accurately. Also other things that I would like to investigate would be the experiment of time against amount of gas produced to show at which points the rate of reaction was at best and the curve/line of reaction. I would like to also investigate other factors, which affect the rate of a reaction like temperature and surface area to see how they affect the rate of a reaction. Some other areas in the experiment that I feel I could have improved on were factors like, controlling the stopwatch. There is lots of room for improvement on human error here. But the inaccuracies due to them were minimal because I paid close attention to them during the experiment. ...read more.

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