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To investigate the effect of varying concentration on The reaction between magnesium ribbon And hydrochloric acid.

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Introduction

To investigate the effect of varying concentration on The reaction between magnesium ribbon And hydrochloric acid Introduction In this experiment the factor to be investigated is the concentration of Hydrochloric acid on magnesium ribbon. This means that all other factors must stay the same or else this would not be a fair test. I am going to investigate how different acid concentrations affect the rate of the reaction with Magnesium. I am measuring how much Hydrogen is given off in a certain time span. I am going to use five different concentrations of acid and I'll change the concentration by diluting each volume of acid with a certain percentage of water. This means that the overall volume of the liquid is the same all the time (50ml), but just varying concentrations. In order to make sure that this is a fair test and the results are accurate, I will repeat the whole experiment three times and work out the average. The results will not be completely accurate as some Hydrogen may escape before the reaction is sealed. ...read more.

Middle

* Measure out 5cm of Magnesium. * Put magnesium in solution and quickly connect to gas syringe and start the stopwatch and time for 30 seconds. * Once 30 seconds has passed, look at the gas measured and write down results. * Pour end solution into designated bucket and repeat 2 more times with same measured out solution before moving onto next concentrated solution. * Work out average of each experiment and use that in the graph. Safety To keep myself and others around me the following should be followed: * Not do this experiment near fire, as Hydrogen is flammable. * People should wear goggles, as Hydrochloric acid is very acidic and would sting and burn if it were to get into your eyes. * People should wear lab-coats as they protect your clothes from discolouring when Hydrochloric acid is spilt on them. * Girls with long hair should tie it back as they may knock something over with their hair or their hair may touch acid. Results Experiment 1 Magnesium (cm) ...read more.

Conclusion

When there is a higher concentration, there are more acid particles, therefore there is a higher chance of one of them colliding and reacting with a Magnesium particle. This is why the reaction occurs so fast to begin with. Then, as there are less acid particles and more water, there is less chance of these collisions, so the time taken is longer. This can be seen in the graph. Evaluation My experiment all went well apart from the last three readings, in the last experiment. I must have measured the acid out incorrectly or perhaps the magnesium was not exactly 5cm because all the readings were different by a large amount. Because of this human error, I repeated the experiment. I noticed that through the course of the experiments, the readings seem to get higher in value. If I had more time, I would have done the experiments more times each for a fairer test. I would also use more accurate and new equipment, as the equipment I used has been used many times before and may not measure the reaction rate perfectly. ...read more.

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