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The Rate of Reaction between Hydrochloric Acid and Magnesium when the Concentration of Acid is changed.

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Introduction

The Rate of Reaction between Hydrochloric Acid and Magnesium when the Concentration of Acid is changed. The reaction between hydrochloric acid and magnesium will produce hydrogen gas, and the magnesium will dissolve. Chemical reactions involve reactants, which when mixed, can produce a chemical reaction. The chemical reaction will take place when the magnesium is dropped into the hydrochloric acid. The products, which will be formed in the reaction, are magnesium chloride and hydrogen (gas). The formula for this is Mg (s)+ 2HCL (aq) ------- MgCL2 (aq) + H2 Magnesium + Hydrochloric Acid ----- Magnesium Chloride + Hydrogen The magnesium will react with the Hydrochloric acid, as it is higher in the reactivity series than hydrogen. Anything lower in the series than hydrogen will not react with hydrochloric acid, gold for example would not have a reaction with the acid. There are certain factors that will make the rate of the reaction change. For example: * Temperature of the Acid * Mass of Magnesium * Concentration of Acid The collision theory is why these factors will change the rate. ...read more.

Middle

I predict that the higher the concentration if acid then the higher the rate of the reaction will be. I think there will be more collisions per second if the acid is more concentrated. Method: I will drop a decided amount of magnesium into a solution of hydrochloric acid mixed with different amounts of water each time. I will record with a stopwatch, how long it takes each time for the magnesium to dissolve. I will repeat the test twice. To keep my experiment a fair test I will do the following things: * Keep the volume of acid the same each time. * Change the water by five milliliters ONLY each time. * Keep the length of the magnesium the same each time. To keep the experiment safe I shall: * Wear safety goggles. * Be careful to not spill the acid. * Be careful with the glass I use, as it is easily broken. I think that the one factor I will find hard to keep the same is the temperature of the experiment. ...read more.

Conclusion

I cannot seem to find a relationship between my results and I feel disappointed, as I think I should have. The results on the graph seem quite anomalous, as they are not in line. I would have expected that as the concentration is doubled, the rate should half, but it has not worked. I think this has something to do with the way the experiment was set up. I think I should have used a different method of finding out the time, like collecting the hydrogen gas for example, which would have been more accurate. I think that next time I would definately try to make it a fairer test and think of all the ways it could be achieved and carry them out, as the way I did it was quite careless. I think I should have carried the test out more times, to get some more results, to make sure what I was doing was correct. I do not really think my results make sense, which is something I should look into and try to discover what changes, if any, I could do to make it work better and to receive a better set of results. ...read more.

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