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Titration - The aim of this experiment is to determine the volume of acid that will react with a carefully measured volume of alkali (base).

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Introduction

Titration Aim The aim of this experiment is to determine the volume of acid that will react with a carefully measured volume of alkali (base). Prediction Universal indicator Acid Alkali Neutral Red Purple Green Methyl orange Acid Alkali Neutral Red Yellow Yellow Methyl red Acid Alkali Neutral Orange Blue Red Phenolphthalein Acid Alkali Neutral Clear Purple Clear My prediction when using 10ml of 0.02m solution of sodium hydroxide (NaOH) is that 75ml of hydrochloric acid (HCl) will be needed for neutralisation. I also predict that when using 10ml of 0.15m solution of sodium hydroxide is that 15ml of sulphuric acid (H2SO4). ...read more.

Middle

This was released slowly until the indicator turned green showing neutralisation had taken place. The test was repeated exactly but instead of HCl, H2SO4 with a molar of 0.1 was used in its place. The amount of acid used to neutralise the base was recorded in both cases. The type and volume of acid that was used in these tests were variable. Safety Normal laboratory safety conditions applied. Other safety precautions that had been taken were goggles were worn to protect eyes, lab coats were worn to protect clothing and distilled water was close by for rinsing any spillages. Results The results in volume shown are the amount of each chemical used to achieve neutralisation and change the universal indicator green. ...read more.

Conclusion

Evaluation The titration process was successfully completed in both experiments. Although my prediction for the first experiment was very close to the result, whereby I predicted a result of 75ml and the amount used was actually 78ml of acid. The prediction and result for my second experiment was not close, predicting 15ml when only 5.6ml of acid were needed to complete a titration. This could have been due to the fact that there were two hydrogen ions in every molar of sulphuric acid making the acid stronger and ionising over two steps. The more hydrogen ions an acid produces the stronger it is. Therefore for every 1 unit of acid needed two units of alkali would be needed. This experiment was done accurately and correctly. It also went very well. Kristy Kish ...read more.

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