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# What affects the rate of reaction between a metal and an acid?

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Introduction

What affects the rate of reaction between a metal and an acid? Factors that may affect the experiment + fair test The variables that could affect the rate of reaction are the temperature, amount of magnesium, concentration of acid, surface area of magnesium and volume of acid. The variable I am going to change is the concentration of acid. I am going to measure how long it takes a piece of magnesium(no more than 20m in length) to react in different concentrations of acid. When magnesium is placed into hydrochloric acid, it reacts by the acid particles colliding with the magnesium particles. I am doing the experiment, using the magnesium in ribbon form. This will give me a good set of results, if I was to use magnesium powder, the reaction would be over fairly quickly, because the surface area of magnesium will be a lot greater which will mean, there will be a lot more collisions that take place between the magnesium particles and acid particles, in a much smaller amount of time. The collisions are likely to be more successful if the acid concentration is stronger, this means there will be more acid particles to collide with magnesium particles, to give you more chance of a successful reaction. ...read more.

Middle

cylinder * Goggles Prediction I think the experiment could go similar to our preliminary work, if we are using 15mm of magnesium with different concentrations of acid. The results will be all around the same (using the same concentrations and amount of magnesium). But as I increase the concentration the reaction time should be decreasing. If we use 20ml of acid and 10ml of water we are not getting full concentration of acid this will affect the rate of reaction because the magnesium will not be reacted as fast as it is been hit with water particles which have no affect unlike the hydrochloric particles, which will attack the magnesium and react in it. When you want a stronger concentration of acid, then you must add more acid, so you are adding more acid particles in with the current particles of water and acid. Which means there is a lot more acid particles than the water particles, this means that the magnesium will react faster because there is more acid particles. So this means more successful collisions are likely to take place, between the magnesium and acid particles. To make a concentration weaker, you add more water, this means there is a lot more water particles than the acid particles, so the reaction of the magnesium will take longer. ...read more.

Conclusion

They results are plotted because of the fact that the magnesium will have had a large surface area that is exposed to acid and water particles which will be colliding with the magnesium surface causing a reaction( only the acid particles will react, the water particles will just bounce off, it would be unsuccessful) This anomaly appears to be well out of the line of best fit, I think we made a mistake with the readings, we took of the reactions we did. As this experiment was done in a group, it could have been 1 of work mates, who slipped up and made a mistake but it is my responsibility, to make sure that I get my results done accurately. We could have improved our coursework by making sure we did the experiments on time. And worked at a reasonable speed instead of chatting too much and lagging behind the rest of the class. To back up our theory we could do the experiment which we prove our results and theory. We tried to make sure that our magnesium ribbon was the same size all the way through. It could have been easier if it was a powder then we could have weighed it to get a precise amount. It was quite a good experiment we are learning new things. By Lewis Jones 10AP Lewis Jones ...read more.

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