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# Investigate how hydrochloric acid changes the rate of reaction

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Introduction

Title: To investigate how hydrochloric acid changes the rate of reaction. Aim: I will investigate how changing the concentration of hydrochloric acid affects the rate of reaction between hydrochloric acid and magnesium. Hypothesis: I predict that as the concentration of hydrochloric acid increases the rate of reaction will also increase. Also if I was to double the amount of hydrochloric acid particles, the reaction will be twice as fast. Background information: The concentration of a solution tells us how many particles (moles) there are in 1dm-3. The factors that can affect the rates of reaction are: * changes in temperature, * changing the pressure, * changing a surface area of a solid reactant, * adding a catalyst, * Changing the concentration of a reactant. The concentration of hydrochloric acid means how many particles of hydrochloric acid are in a given area. This means if you increase the amount of hydrochloric acid there will be twice as much particles in a given area. If I had only 1mol dm-3 of hydrochloric acid solution, there will only be a small amount of hydrochloric acid particles to react with magnesium particles, and there will be a very small chance of successful collisions. ...read more.

Middle

Therefore there must be three magnesium strips cut to 1cm used throughout the experiment. The magnesium strips should also be cleaned before they are placed in the flask, for the reason that the magnesium may react with something else for example oxygen and this may cause the rate of reaction to either speed up or either slow down. Conclusion: In conclusion my prediction was correct as my graph shows that when the concentration doubles the rate of reaction doubles. In my prediction I explained the more concentrated my hydrochloric acid was there will be twice as much collision; this is shown in my graph as the concentration is proportional to my rate of reaction. However the last point is very high this was because of an exothermic reaction, this also may be the result of not washing the flask out carefully. Analysis: As the concentration of hydrochloric acid increases, I found that as the acid was more concentrated, the quicker the reaction was. This is explained in a lot more detail by using the collision theory, the collision theory is when there is a higher concentration of acid therefore there will be more acid particles in a given area to react. ...read more.

Conclusion

This makes my method more reliable as it gives me more time to record and time the results, therefore I will have a set of reliable results. If I was to repeat this experiment again in future I would clean the magnesium before I placed it in the flask, because as I mentioned in my fair test the magnesium may of reacted with another gas in the air for example oxygen, this would then give me magnesium oxide and this will make a huge effect on the results. Therefore in future to make my results more reliable I will clan the magnesium before placed in the flask. To make my results more reliable in future I would repeat the experiment three or four times instead of twice, this will give me more replicates and I will a set of accurate results. In future I will also give myself a longer fixed time to do the experiment in, as I only had a minimal amount of time to do this experiment in. I would also use more concentrations of hydrochloric acid to see the better effect it has on the concentration and the rate of reaction. ?? ?? ?? ?? ...read more.

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