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How a different concentration of acid each time, with a fixed temperature will effect reaction.

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Chemistry Coursework How a different concentration of acid each Time, with a fixed temperature will Effect reaction Aim The aim of my experiment is to find out and research why different concentrations of hydrochloric acid and water mixed together will effect the reaction of a piece of magnesium with the acid and water. Identify the variable There are three different variables, which I have the choice of changing, these choices are as follows; * I can change the concentration of hydrochloric acid and water but keep a fixed temperature. * I can change the temperature of the hydrochloric acid and water, before adding a piece of magnesium. * Or finally I can change the surface area of a piece of magnesium. I have decided to change the concentration of hydrochloric acid, and keep a fixed temperature. I decided to choose this investigation as with the other experiments, it would not be a fair test, as I could not be sure that the temperature would be constant at the right @. Also changing the surface area does really appeal to me. I know that if I change the concentration, I will get different rates of reaction each time. Mg + 2HCL MgCL + H Prediction I predict the lower the amount of acid in the concentration, the slower the rate and speed of reaction. ...read more.


Step 4; Pick up the stop-watch and a piece of magnesium strip. Drop the strip of magnesium into the acid, as soon as the strip hits the acid press the start button on the stop watch. Step 5; Press the stop button on the stop-watch when the magnesium piece has totally gone from inside the beaker and acid. Step 6; Record the time on a table or somewhere. Step 7; Clean out the apparatus, and then mixed together 70ml of acid with 10ml of water and start all over again. Step 8; Keep on doing this until you get to the proportion of 10ml of acid to 70ml of water. Step 9; You should have all the data you need now. Step 10; Clear away all the apparatus and make sure the desk you were working at is tidying. Fair Test To make my experiment a fair test there will be a number of things that I must carry out. The first thing at I must do is to use all the same apparatus throughout the experiment. Also the magnesium strips that I put in the acid and water must be the same length, all the time. This length is two centimetres. The experiment should really be done in one lesson, if the experiment is done over two different lessons then the temperature may have changed, causing the reaction to be affected. ...read more.


Evaluation I think that the experiment that I conducted was very professional, and the evidence that I obtained was to a high standard, and is reliable as i followed this procedure to a good level. The evidence that I gathered was what I had been expecting from this experiment. The suitable of this procedure for obtaining the results prove to be beneficial for the experiment. I could improve my results for one; I could of took three sets of data and then taken the average of them to come out with the best result possible, Also I could have weighed the piece of magnesium instead of just measuring the length, this would of made my results even more accurate. There is only one way which I could of provided more additional evidence would to be to measure the amount of hydrogen which was given out by the reaction. All I would have to do is to check that the magnesium strips were the same, and that I changed the concentration each time. The amount of Hydrogen produced in each reaction would be different as there are different concentration levels. Then by finding out how much hydrogen as given off I could then relate this to, the rate of reaction by the quicker the hydrogen was released the faster the rate of reaction would be. The reliability of the evidence is sufficient to support the conclusion. The evidence of both my preliminary test and my actual test are very good and account for what I predicted. ...read more.

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