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An Experiment to Investigate a Factor that Affects the Rate of Reaction between Magnesium and Sulphuric Acid.

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Introduction

An Experiment to Investigate a Factor that Affects the Rate of Reaction between Magnesium and Sulphuric Acid. I want to find out what factors affect the rate of reaction between magnesium and sulphuric acid. The factors that are likely to affect me investigation are: * Concentration of the acid * Surface area of the magnesium * The temperature of the acid * If a catalyst is used I am going to investigate how the concentration of the acid affects the rate of reaction. I decided on this variable as it became increasingly obvious that the other 3 variables had drawbacks. I could not investigate the surface area of the magnesium, as only two different types were available, magnesium ribbon and magnesium powder. I decided that to investigate the temperature of the acid would be too dangerous as acid is dangerous enough but I did not want to be working with hot acid for fear of injuring others or myself. I decided against investigating the catalysts as I am not experienced enough to know which catalysts would work in this experiment and it would take to long to find a few from the enormous number of chemicals available. Scientific knowledge I have scientific knowledge about rate of reactions, the collision theory and moles that may be useful in planning my investigation. ...read more.

Middle

The reaction rate therefore increases. Independent Variable I will change the concentration of the acid in my experiment. Controlled Variables I will keep the temperature of the acid, the surface area and weight of magnesium and the total volume of acid solution the same to ensure a fair test. I am going to measure the time needed until all the magnesium ribbon has dissolved into the differing concentrations of acid. I am going to take 5 different concentrations of acid starting from 1 molar - 0.33 molar. I will repeat each of the experiments 3 times each for the 5 acids, resulting in 15 experiments. I will try to make these as accurate as possible by weighing each of the strips of magnesium on digital scales. By using a burette to make sure I get an exact volume of acid and by using an excess of acid so all the magnesium will disappear and I will not have to judge when the bubbling stops. I will read all my measurements carefully. I will also stir the acid the same number of times when making the different concentrations of acid. This factor is quite important because it determines exactly what the concentration of the solution is each time it is mixed, if the stirring factor is not carefully controlled it could lead to inaccurate results if the concentration of the acid solution is not what I calculate it to be. ...read more.

Conclusion

1. Weigh 0.13g of magnesium ribbon 2. Use the burette to measure 30cm3 of sulphuric acid 3. Empty the contents of the burette into a beaker, making sure to touch the bottom of the pipette onto the surface of the rest of the acid. This will make the experiment more accurate as you will have exactly 30cm3 of sulphuric acid. 4. Drop the magnesium into the beaker of acid and as soon as it is in the acid start the timer. 5. When all the magnesium has dissolved into the acid, stop the analogue timer. 6. Repeat the experiment two more times. This will enable you to get an average and a more accurate result. Do not stir the solution at any time. Safety I will work safely, take care and wear safety goggles at all times throughout this experiment, as acid is being used. Recording Results I will record my results in a table like this. I will use these results to form a table. T I M E (Secs) Vol. Acid (cm3) Vol. Water (cm3) Conc. (M) 1 2 3 Average Time 0.33 0.5 0.66 0.83 1 This is the graph that I will use to find my conclusions. I am going to put my results into a graph, as it is easier to see patterns in a graph than in a table. Y Concentration Of Acid (Moles/litre) X Time (secs) ...read more.

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