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Magnesium and Hydrochloric Acid.

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Introduction

Magnesium and Hydrochloric Acid Coursework Aim The aim of this investigation is to determine what affects the rate of reaction when magnesium and hydrochloric acid are combined to form a solution. The variable that my group are going to change shall be the concentration of acid (the acid used in this experiment is going to be hydrochloric acid). We are going to control the temperature, the amount of acid and the amount of magnesium. We are going to measure the amount of hydrogen given off from the experiment. Prediction I expect that the magnesium will displace the hydrogen in hydrochloric acid, to form magnesium chloride. I expect this to happen because magnesium is higher in the reactivity series than hydrogen. If an element is higher in the reactivity series than an element from a compound, it will displace it. In this case, magnesium will be displacing hydrogen. This is called a displacement reaction. Magnesium is an element and hydrochloric acid is a compound, made up of hydrogen and chlorine. ...read more.

Middle

I am doing this to check that the volume of gas that I have chosen (100cm�) will be sufficient for the experiment. Concentration of acid (molar) Time taken to release 100cm� gas (seconds) 2.0 13.63 1.6 32.64 1.2 40.35 I will do a mole calculation to work out a suitable volume. Moles = mass / R.A.M. = 0.1 / 24 = 0.0041666 volume = moles * 24 000 = 0.00416 * 24 000 = 100 I am going to measure the amount of hydrogen given off by the reaction by using a burette, which will collect the hydrogen, and give an accurate reading as to how much hydrogen has been given off. This is a list of the apparatus that I am going to use: > Conical flask > Measuring cylinder > Delivery tube > Plastic tub > Water > Magnesium > Hydrochloric acid > Stopwatch > Safety goggles Here is a diagram of the apparatus hat I am going to use for the experiment: As with all science experiments, safety precautions need to be used. ...read more.

Conclusion

The recordings after three minutes for the 1.2, 1.4, 1.6 and 1.8 concentrations of acid (molar) dipped (in the case of the 1.8 recording, it dropped to below the original recording after one minute). These results should have either stayed the same as the two minutes recording or increased (probably increased). This shows that the experiment was not carried out accurately enough. Evaluation I felt that overall the investigation for my group went fairly well, though I was disappointed with some of the results, as they did not follow the general trend. As I mentioned in the conclusion, this may be as a result of the experiment not being carried out accurately enough. There are several possible reasons why some of the results were anomalous. As the magnesium was added to the hydrochloric acid, there was a moment before the bung could be attached, which possibly allowed some hydrogen to escape. To solve this problem, I would have had to use some sort of apparatus that involved using a pre-fixed bung. This would have stopped any hydrogen escaping. Jordan Hoose 1 ...read more.

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