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Reaction between Magnesium and Hydrochloric Acid

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Introduction

Chemistry Coursework-Reaction between Magnesium and Hydrochloric acid. I am going to investigate how the concentration of the acid in the reaction affects the speed at which the gas, hydrogen, is given off. Magnesium + Hydrochloric acid -----> Magnesium chloride + Hydrogen Mg + 2HCl -----> MgCl2 + H2 Prediction I predict that as I increase the concentration of the hydrochloric acid, the speed the gas is given off will also increase. I think this because the reaction is caused by collisions between the acid particles and the metal particles. As I increase the concentration of the acid, more acid particles will be in the same volume of solution. This means that the collisions are more frequent, therefore the rate of reaction is faster and the gas is given off quicker. Preliminary Experiment I am going to use different concentrations of acid in the experiment to find the highest and the lowest molar values of acid I will use in the actual experiment. ...read more.

Middle

Unfortunately my time was limited and I did not have time to do this. Final Experiment Apparatus * Conical flask. * Delivery tubing. * Magnesium * Hydrochloric acid. * 100cm3 measuring cylinders. * Water basin. * Water. * Timer. Method I will measure 0.25g magnesium and dilute the hydrochloric acid to the required strength. I will set up the apparatus as shown above, filling the measuring cylinder with water to be displaced. I will then put the magnesium into the hydrochloric acid, put the bung in the flask and time how long the water takes to displace. To obtain accurate results I will repeat each experiment 3 times and work out an average. To make the experiments fair I will keep the following things the same and just change the acid concentration: * Amount of magnesium. * Temperature of experiment. * Amount of solution. * Surface area of magnesium. I will wear safety glasses to make the experiment safer. ...read more.

Conclusion

* Measured all the liquids from the meniscus in the measuring cylinders. * Started the timer at the same point each time: when the bung was replaced to the flask. * Cleaned the measuring equipment before each experiment. There were factors that could have made my work inaccurate, such as the fact that I had to carry out the experiment on different days and I only had an hour on each of the days. Some other things that may have made my results inaccurate are: * The temperature in the laboratories may not have been the same on the different days. * The timers may not have been accurate. * There may have been errors in my recording of the results when the displacement had finished. I could have made my experiment better by carrying out all the experiments on the same day and in a controlled environment. I could have used a gas syringe to collect the gas, instead of a measuring cylinder, This would have made it more accurate. I could also have taken more readings to prove the trend better and to make the results and graph more accurate. ...read more.

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