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Neutralising alkali at different concentrations

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Introduction

Ben Tenneson Neutralising alkali at different concentrations Planning Apparatus used Burette Stand and clamp Flask Beaker Background information Acids and alkalis all have different pH's, this is how strong they are. pH 1 is the property of a very strong acid, and pH 14 is the property of a very strong alkali. pH 7 is neutral, a liquid that has a pH of 7 is water. In this experiment I changed the concentration of the alkali, this is how many atoms there are in a certain area. Method I will put the Burette into the clamp and fill it with 50cm cubed of acid. I will then put the amount of water and alkali that I need for the certain concentration into the flask. ...read more.

Middle

I will also make sure that I do all the readings in order to stop any change in the way that the results are read. Prediction I predict that as the concentration of the alkali decreases it will become neutralised much quicker. Graph 1 shows my prediction. Reason The scientific reason for my prediction is this: As the concentration of the alkali decreases, the number of alkali atoms will decrease. This means that it will take less acid atoms to neutralise the solution. Also as more water is added I order to make the alkali weaker, it will cause the liquid to become more neutral anyway. Therefore requiring even less acid to make it neutral. Observations I will include my preliminary experiment. This shows me what range of results I can expect from the real experiment, it also helps me to check if I am doing the experiment correctly. ...read more.

Conclusion

Evaluation From my results I can tell that as the concentration of alkali decreases the amount of acid required for neutralisation also decreases. The experiment went well but could have been greatly improved if I had more time. I could have repeated each concentration more times in order to get better results. From my results I can't tell if one of them is wrong but if I had three then I could tell an anomalous result from the others. In some of the experiments I may have added a bit too much acid than was needed so if I had more time then I could go slower and make sure I only recorded as much as was required. If I was able to use equipment that constantly keep the solution mixing then I would be able to tell the exact moment it was neutralised. ...read more.

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