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To investigate the effect of varying concentration on the reaction between Magnesium ribbons and Hydrochloric acid.

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Introduction

To investigate the effect of varying concentration on the reaction between Magnesium ribbons and Hydrochloric acid. Introduction The factors that I'm exploring will change the rate of reaction because of the Collision Theory. This is a theory that is used to help predict the rate of a reaction. The Collision Theory is based on the idea that for a chemical reaction to take place, it is necessary for the reacting particles to collide with each other with enough energy to break or form new bonds between the other particles i.e. swapping or sharing particles, which is called a successful collision. If when they collide and they do not have enough energy to break or form new bonds then they will simple bounce off each other, causing an unsuccessful collision where no reaction will take place. If you want to speed up a reaction, you need to get these particles to hit each other more frequently. If the solution is made more concentrated it means there are more particles of reactant knocking about between the water molecules, which make collisions between the important particles more likely. ...read more.

Middle

I predict this because I know that the higher the concentration of the acid, the greater the number of acid molecules present in that volume. This means that there are more acid molecules colliding with the particles on the surface of the reactant (magnesium) thus increasing the rate of reaction. Fair Test In order to keep my experiment a fair test I will have to make sure that I keep the following factors the same:- temperature of the Hydrochloric Acid, the same size, amount and roughly the same mass of the magnesium ribbon used, concentration of the Hydrochloric acid in each of the three times I do the experiment with the same concentration, I will also have to make sure that the gas syringe is connected properly, this is so that no gas that is given off can escape. I must also take the reading of the amount of gas given off at the same interval of time, on each occasion the experiment is done. Apparatus Conical flask Stop-clock (sensitivity 1/10s) Magnesium (5cm long) ...read more.

Conclusion

I was right in my prediction but I did not predict that the rate of reaction slows down as time goes on which did happen in my experiment. Evaluation My experiment all went to plan as it was meant to, apart from the last set of three in which I had the acid measured out at 50ml and no water to dilute it, the experiment went wrong because I think might have measured out incorrectly the diluting substance i.e. water. I then redid those three experiments and put them at the bottom of the original table. Although the last few experiments were differed form what they should have been on the whole I measured and conducted my experiments with care and precision, this way I can be sure my conclusions are accurate. If I would have had more time to do another lot of the experiments so instead of doing each one three times I would have done it four or five so that the average could be more accurate. As well as having more time I think if I would have had more accurate equipment the results would have been more precise as to the rate of reaction. ...read more.

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