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# Concentrations of Acid

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Introduction

Concentrations of Acid Introduction. Rate of reaction is the time taken for a reaction to take place from start to completion. In this experiment we will be investigating how the concentration of acid affects the rate of reaction. Other factors that affect rate of reaction are the surface area of the substance being reacted, the temperature, any movement during the reaction or any catalyst used. Substances react because of the collision theory. This is that particles of acid collide with a substance faster the hotter it is because they have more energy. The amount of particles that are exposed to the acid (surface area) is also a factor. Aim. In this experiment we will aim to find out how the concentration of acid affects the rate of reaction of a piece of magnesium. ...read more.

Middle

We will do the experiment 3 times with each concentration of acid to get a reliable average. Safety. For safety we will wear safety goggles and wash hands after the experiment. Apparatus. We will use various concentrations of acid, 1cm pieces of magnesium, water, conical flask, sandpaper, stop clock, safety goggles. Method. 1. Sand down the piece of magnesium to remove the oxide layer and place in conical flask. 2. Add concentration of acid as in table below and start stop clock. 3. When the magnesium has reacted completely stop the stop clock and record time. 4. Do this 3 times for each concentration of acid. Concentration of acid (mol-dm3) Amount of acid (ml) Amount of water (ml) 2 50 0 1 50 0 0.8 40 10 0.6 30 20 0.4 20 30 0.2 10 40 Results table Concentration of acid (mol-dm3) ...read more.

Conclusion

Evaluation On the whole the method that we used worked well although we were unable to complete the experiment for the 0.2 mol of acid. The results obtained were generally good. The only odd result was the first result for the 0.8 mol of acid. This was more than a minute longer than the other two results. The method worked well but to make better use of the time available it would have been beneficial to carry out all three experiments requiring the same concentration of acid at the same time The results are fairly reliable. The one odd result may have possibly been down to either the size of the magnesium strip being larger than the others or due to it not have been sanded down adequately. The average of the three results is sufficient to draw a reliable conclusion but the more reactions are carried out the more reliable the results will become. ?? ?? ?? ?? Chris Longster ...read more.

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