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# How does the concentration affect the rate of the reaction between Magnesium and Hydrochloric Acid?

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Introduction

How Does the Concentration Affect the Rate of the Reaction Between Magnesium and Hydrochloric Acid? Aim-I have decided to investigate how the concentration of Hydrochloric Acid affects the time taken for a 2cm piece of Magnesium to fully react and dissolve. Theory-The following variables can affect the rate of reaction between magnesium and hydrochloric Acid; Surface Area With a larger surface area of solid, collisions between solid and particles are much more frequent, therefore more collisions/second equals a greater rate. Concentration A larger concentration means there are more collisions/second because the particles are closer together. Temperature If the Acid is heated then the Acid particles will have more energy so this means more collisions/second. Catalyst There are no Catalysts for this experiment. Prediction-In this experiment, I think that if the Concentration is doubled, then the rate of reaction will be a lot faster because of what was mentioned in the theory about concentration. After studying the theory, I made this decision because if there is a larger concentration then there isn't much space for the particles to move around, so there are more collisions/second between the Acid particles and the Magnesium. ...read more.

Middle

* Swirl the Conical Flask with a steady hand and not too quick. * Keep your eye on the magnesium so you don't miss the exact point at which it dissolves. * Record everything that you notice * Used distilled water to change the concentration of the Acid Apparatus- * Conical Flask * Beaker * Measuring cylinder * Ruler * Graph Paper * Stop-watch * Magnesium * Hydrochloric Acid * Distilled Water Main Plan- For each experiment I will use 2cm of magnesium ribbon and 2M acid. I will use 25cm of Hydrochloric Acid and when the concentration needs changing I will add Distilled water, because this will give the Acid particles more space to move around and so there won't be so many collisions/second. When I am measuring the Acid or Distilled Water I will need to put my eyes level with the top of the Acid or Distilled Water so that I can read it accurately off the measuring cylinder. Make sure there are no spillages. ...read more.

Conclusion

In the graph of Time against Concentration, my point is proved because the curve shows that the higher concentration then the longer the reaction time. My prediction has been backed up by my results that have been found. I didn't predict that the reaction would be an exothermic reaction, this was a surprise to me. Evaluation-These results that I obtained were of good quality. You have got to give a little lee-way because of experimental error, but on one of my results I had to repeat it because it was 9 seconds off the closest time, so I could get a better and more fairer average. If I was to repeat this experiment I would do more tests, larger concentrations and different lengths of magnesium. This would widen the range of results and give me a better conclusion. I think that I could of done with a few more concentrations just to boost my conclusion because I'm not too happy with the amount of different concentrations that I have used. ...read more.

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