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In a neutralisation reaction between an acid and an alkali, water is formed. Experiment to prove this.

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Introduction

Neutralisation In a neutralisation reaction between an acid and an alkali, water is formed. This is shown in the word equation: Acid + Alkali = Salt + Water We can prove this using an experiment. I will investigate the effect of changing the concentration of alkali has on the volume of acid needed to neutralise it. I will use a titration method to investigate this. In the experiment I am going to use Sodium Hydroxide and Hydrochloric Acid. Therefore my formula is: NaCl(aq) ...read more.

Middle

Diagram: Method: I set up the apparatus as shown in the diagram. I noted the starting position of the acid. I then added the acid gradually to the alkali using the burette. The flask was swirled to let the acid and alkali mix. When the neutralisation was complete the indicator turned colourless showing me that I had to stop adding acid. I took a reading for the position of the acid and calculated the volume used. I did this for 0.2M, 0.4M, 0.6M, 0.8M and 1M sodium hydroxide. I repeated the experiment and took the average so that my data was more accurate. ...read more.

Conclusion

20.9 41.6 20.9 20.7 20.8 1 1 0 24.9 24.9 49.8 24.9 24.9 24.9 Conclusion: I found that the higher the concentration the alkali was, the more acid needed to neutralise it. This happens because the acid was kept at a concentration of 1M therefore less was needed for 0.2M alkali to neutralise it. This was because the concentration of alkali was lower than that of the acid. This meant that there were less hydroxide ions to be neutralised. As the concentration of the alkali increased the amount of hydroxide ions within the alkali also increased therefore needing more acid to neutralise it. ...read more.

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