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Experiment to find out if changing the Concentration of Acid affects the rate of its reaction with Magnesium.

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Introduction

AIM: Experiment to find out if changing the Concentration of Acid affects the rate of its reaction with Magnesium. INTRODUCTION - The experiment I have chosen to do is to change the amount of concentration and see with each amount of concentration if it affects the rate of reaction with Magnesium. Recently in class we have been learning about Rates of Reaction and what affects it. There are four main things that affect it :- temperature, concentration, surface area and catalysts. PREDICTION- I predict that as the concentration of the hydrochloric acid increases, the time taken for the magnesium to disappear decreases. I also predict that when the concentration of the hydrochloric acid is doubled, the rate of reaction is also doubled. I am predicting this due to the collision theory. The collision theory describes how the rate of reaction increases (the time taken for the magnesium ribbon to disappear when it is reacted with hydrochloric acid) when the concentration of HCl increases. The theory states that if, the more concentrated the reactants, the greater the number of collisions between particles increase. This also explains why the greatest rate of reaction is usually as soon as the reactants have been mixed, i.e. they are both at their highest concentrations. AS the reaction continues, the concentration of the reacting substances decreases and so does the rate of reaction. ...read more.

Middle

Even a length of 2.2cm will change the results. I will need to measure the exact amount of water and acid in each experiment, if the volume is not right I could end up with quite a few anomalous results. I am working on my own and have interoperated that it is going to be hard to put the bung on straight away and start the stopwatch so I might need someone to help me with the timing. I will also have to remember to push the gas syringe back after every experiment. It is also a good idea to clean the conical flask before each experiment as there might be some access acid still in there, which could affect the next experiment. APPARATUS - Hydrochloric Acid (400ml) to make different concentrations Magnesium ribbon (20cm) to make the experiment work! 2 Measuring Cylinders each with markings that go up to 50ml Delivery tube from gas syringe to conical flask Gas syringe to measure gas Conical Flask to put HCl, H2O and Magnesium in Ruler (30cm) to measure Magnesium ribbon Goggles to protect my eyes Clamp stand to hole gas syringe Water to make different concentrations Scissors to cut magnesium ribbon Stopwatch to time how long the reaction takes to finish METHOD - In order to make the experiment work I will need to make five different concentrations out of a 1 Molar solution. ...read more.

Conclusion

I carried out the experiment very carefully. It was safe, I kept coats, bags etc out of the way and kept all the glassware away from the edges. The plan was suitable for investigating the aim but it would have been a lot easier to do it with a partner. Maybe if I had done it with a partner I would have got more accurate results. My results were not very accurate as there was many that did not fit my graph. The 0.8M solutions gave off only 11cm3 of gas. This was the only result that was very anomalous. A reason for this could be that the magnesium was floating on the top and only the bottom was attacked by the acid particles or that I did not put the bung on quick enough so I must of lost a lot of gas at the beginning. I also thought that changing the gas syringe might help the results as the one I had stuttered a few times. If I had more time I could have extended the experiment by seeing if the concentration changes the sound pitch of the 'pop' when you test it with a lighted splint. I could of also extended it by changing the acid to a different one or by changing the metal to a different one. This way I could see which metal reacts with different acids the most.00 JOTSAROOP VIRDEE 11 YELLOW ...read more.

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