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Investigating temperature change when different Volumes of acid and alkali are mixed.

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Introduction

Investigating temperature change when different Volumes of acid and alkali are mixed Prediction My prediction is that the biggest temperature change will be when there are equal amounts of H+ ions and OH-, this is because create an optimum mixture for the ions to neutralise each other. Apparatus * Empty plastic yoghurt cup * thermometer * Hydrochloric Acid * Sodium Hydroxide * Two measuring cylinders Diagram 30ml� Hydrochloric acid Thermometer Measuring Cylinder Plastic cup 30ml� Sodium Hydroxide Method First of all we decided to use a plastic cup because it was easy to wash off the mixture. We poured out 30ml of Hydrochloric acid in to one measuring cylinder and poured 30ml of Sodium Hydroxide into the other measuring cylinder. Then we added the Sodium Hydroxide to the plastic cup and left it for 25-30 seconds, we then took the temperature of the alkali before adding the acid. ...read more.

Middle

26�C Rise 6�C 15ml� of Sodium Hydroxide + 345ml� of Hydrochloric Acid Start 20�C End 23�C Rise 3�C 2nd Results Chemicals + Measurements Temperature 30ml� of Sodium Hydroxide + 30ml� of Hydrochloric Acid Start 20�C End 25�C Rise 5�C 40ml� of Sodium Hydroxide + 20ml� of Hydrochloric Acid Start 20�C End 27�C Rise 7�C 20ml� of Sodium Hydroxide + 40ml� of Hydrochloric Acid Start 20�C End 24�C Rise 4�C 45ml� of Sodium Hydroxide + 15ml� of Hydrochloric Acid Start 20�C End 25�C Rise 5�C 15ml� of Sodium Hydroxide + 345ml� of Hydrochloric Acid Start 20�C End 23�C Rise 3�C Average Results Chemicals + Measurements Temperature (to the nearest degree) 30ml� of Sodium Hydroxide + 30ml� of Hydrochloric Acid Start 20�C End 26�C Rise 6�C 40ml� of Sodium Hydroxide + 20ml� of Hydrochloric Acid Start 20�C End 27�C Rise 7�C 20ml� of Sodium ...read more.

Conclusion

This type of experiment is also called an exothermic reaction. Evaluation Overall I thought are experiment went according to plan and we had accurate results. My results I received were good but I could improve the experiment by, carrying out the experiment more times this would improve the consistency of the results. Secondly I would put a lid over the plastic cup to help hold in the heat longer this would make the experiment more accurate. The final thing I would do is to conduct a bigger variety of different mixtures to make the experiment more precise e.g. 10:50, 35:25 and 25:35. On my graph there were a couple of anomalous results I think this is due to human error and some of the heat may have been lost during the experiment. Josh Mills 10X ...read more.

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