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I have been given several different concentrations of Hydrochloric acid and asked to carry out an experiment to find out what factors affect the rate of an acid rain reaction.

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Introduction

Coursework Experiment Introduction I have been given several different concentrations of Hydrochloric acid and asked to carry out an experiment to find out what factors affect the rate of an acid rain reaction. Prediction The information from my notes about what factors effect rates of reaction tells me that if the acid has a high concentration it increases the rate of reaction, if an acid has a high concentration it means there are not as many water molecules as there are acid molecules. Reactions take place when the element or compound you want to react with the acid come into contact with an acid molecule if the is more water particles (low concentration) the particles have less chance of making contact as the water particles obstruct. I predict that the experiment using the 2M HCL acid will have the fastest reaction. ...read more.

Middle

The pieces of equipment I will be using are; different concentrations of acid, two conical flasks, a bung, a tube, lime water, marble powder, scales, two beakers, measuring cylinder, and weighing boat for scales, a spatula, and a stop watch. Diagram Variables Input The variable I will be changing is the concentration of the acid. These concentrations will be; 2M, 1.5M, 1M, 0.5M and 0.1M. Output I am measuring the time taken for the limewater to go cloudy enough for the cross on the paper to become not visible. I will measure the time taken for the limewater to go cloudy enough for the cross on the paper to become not visible by using a stopwatch. I plan to do this 3 times for each crisp. Controlled I will keep the Volume of the acid at 100ml as well as the limewater. ...read more.

Conclusion

Graphs See graph paper Analysis The rate of reaction increases as the input variable quantity is increased. This is shown by my graph, it is a curve showing increase in concentration leads to lower rate of reaction (time). These patterns occur due to the collision theory that the more acid particle the more likely the will be contact between acid and marble powder grains though I do not believe my experiment to be very accurate or reliable (see evaluation) my original prediction was correct. Evaluation The odd results can be account for by the unreliability of my experiment/method. Each time we performed the experiment we had no way of being able to put the bung in the conical flask at exactly the same time so carbon dioxide escaped and in different amounts for each experiment. Most of my repetitions were all similar except for the anomalous results shown in the table above. ...read more.

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