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What affects the reaction rate between magnesium and sulphuric acid?

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Introduction

Aim The aim of the investigation is to find out what affects the rate of reaction between Magnesium and Sulphuric Acid. Introduction When Magnesium reacts with Sulphuric Acid, a chemical reaction takes place and there are two products formed. These are Hydrogen (a gas) and Magnesium Sulphate (a liquid). The reaction finishes when the two reactants have finished. The formula for this chemical reaction is Mg+H2SO4 H2+MgSO4. Variables There were 4 variables that we could have chosen, that would all affect our experiment and they are: * To use a catalyst to speed up the reaction. * To increase the surface area of the Magnesium. * To increase the temperature of the Sulphuric Acid. * To increase the concentration of the Sulphuric Acid. Using a catalyst would make the reaction faster so there would be a very different reaction rate. The catalyst does not actually take part of the reaction and it remains chemically unchanged. Catalysts are specific to certain chemical reactions and there are different catalysts for different reactions. Increasing the surface area of the Magnesium would mean an increase of reaction speed and another different reaction rate would take place here. Increasing the temperature of the Sulphuric Acid would also make the reaction faster because the particles of the acid would be moving a lot faster. ...read more.

Middle

We found out that using 3cm length Magnesium strips are best because they are not too quick during reaction and that you cant measure them in time, and aren't too slow and that they take too long to record in 1 lessons time. We also found out that 2 molar acid is better to use than 1 molar acid. The 2 molar is better because the 1 molar acid will take to long to react with the Magnesium. Apparatus The list below is all the apparatus we used: 2 Molar Sulphuric Acid (H2SO4) A Stopwatch 100cm3 Beaker 10 strips of 3cm Magnesium 50cm3 measuring cylinder Water Safety Glasses Method 1. First of all we need to collect all the apparatus from the apparatus list and put on the safety glasses. 2. Measure out the desired amount of acid and water required for the certain concentration that you are doing into the 50cm3 measuring cylinder. For example I will talk about 50cm3 and no water. 3. Now pour the acid into a 100cm3 beaker. Next put the 3cm Magnesium strip in to the acid and as soon as the reaction starts, start the stopwatch. 4. When the Magnesium stops reacting, stop the stopwatch and take the reading to the nearest second and record on to results table. ...read more.

Conclusion

When the concentration is higher, there are more particles in one space. This means that there are going to be more successful collisions. The faster that the particles collide, there is more chance that the collisions will be more successful. This means that the reaction will finish a lot quicker than an experiment with a lower concentration. Evaluation I think our experiment was very well done and our results were very accurate. We were sure that our results were accurate as we repeated the experiment twice and we got roughly the same results twice. Between the two sets of results there was only about 2-3 seconds difference between them. We also had no anomalous results, which shows our results were accurate and this is also shown on the scatter graph. One slight problem we had was when one of the members working in our group spilt some acid on the table and on his book. Overall I think the experiment was very successful and if we were to do the experiment again then we could maybe collect some of the gas produces to make sure if it is hydrogen by collecting some of the gas and doing the pop test. Also we could have done the experiment for a 3rd time just to make certain that our results are successful and accurate. As I predicted, the higher the concentration the quicker the reaction rate. ...read more.

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