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Find the Concentration of the Unknown Acid.

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Introduction

Find the Concentration of the Unknown Acid. Aim The aim of my investigation is to find the concentration of the unknown acid, 'x'. I have been supplied with hydrochloric acid that has a concentration of 2 mol/dm� and a length of magnesium ribbon. I will time the rate of reaction of a strip of magnesium in the unknown concentration and then do the same using acid of known concentrations. By putting these results onto a graph I should be able to notice any rates of reaction that match up with each other and therefore find the concentration of 'x'. During this experiment there are many variables that I could change. These are: Temperature - I could change the temperature of the acid by putting it in a water bath to increase the temperature or by running it under a cold tap to decrease the temperature. Volume - I could change the volume of the acid I use by either decreasing or increasing the amount each time. Concentration - I could change the concentration of the acid by adding water to the acid of know concentration to weaken it. Catalyst - I could add a catalyst to the experiment. Length of magnesium ribbon - I could change the length of magnesium by cutting it to different lengths each time. ...read more.

Middle

This is because it didn't react to quickly with the higher concentration and wasn't too slow to react with the lower concentration. I was also going to do a preliminary experiment to decide what volume of acid to use in the experiment but couldn't do so as I ran out of time. I will therefore use 20ml of solution because this volume seemed to work well in my preliminary work into the length of magnesium ribbon. Prediction It is impossible for me to predict the concentration of 'x' but I can predict how I think changing the concentration of the acid will affect the rate of reaction. Particles need to collide in order to react. The rate of reaction depends on how often and how hard the reacting particles collide with each other. In my experiment I will be changing the concentration of the acid. I know that if the concentration of a solution is made more concentrated it means that there are more particles of reactant between the water molecules. This makes collisions between the particles more likely. If the particles are more likely to collide, then they are more likely to react. Therefore an increase in concentration causes an increase in reaction. I therefore predict that as I dilute the concentration of the acid, the rate of reactions will become longer because there will be less particles colliding and therefore reacting. ...read more.

Conclusion

The equipment I used was very accurate, I used a burette to measure out my solutions, this gives a very precise measurement. I also used a digital stop clock that is more accurate than older ones and is easier to use. I also think that my method was quite accurate, but there are still some improvements I could make. I could use a wider range of values that cover those which occur between the ones I picked. This would give me a more precise answer. I could also of repeated each experiment more so that I had a wider range of values to use to find the average. This would also help to make sue that anomalous results don't affect my conclusion. Figure 2 shows me that there were quite a few anomalous results in my experiment. The anomalous results are circled in green. This are a result of an inaccurate reading or an error made when diluting the acid. My results do support the prediction I made. I predicted that as the concentration of the acid increased, the rate of reaction would increase. My experiment showed that this is correct because the higher concentrations had a faster rate of reaction than the lower concentrations did. Overall I think that my conclusion is backed up by my results but could be more accurate if I had more time to take repeat readings and re- do the readings that gave anomalous results. Teresa Quinton Chemistry Coursework 11alpha ...read more.

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