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Investigating the effect of concentration on the rate of reaction between sodium thiosulphate and hydrochloric acid.

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Introduction

Investigating the effect of concentration on the rate of reaction between sodium theosulphate and hydrochloric acid. Aim: To investigate whether the time taken for sodium theosuphate to go completely opaque when reacting with hydrochloric acid depends on the concentration of the acid. Prediction: I envisage that the higher the concentration of the acid, the faster the rate of reaction. I think this, as there will be more hydrochloric acid molecules do react with than if it were a lower concentration. ...read more.

Middle

* We drew a cross an a piece of paper and put a comical flask on top * We then poured 50 cm3 of sodium theosulphate into the conical flask and added 10cm3 of hydrochloric acid and timed how long it took for the cross to disappear. * We recorded our results and continued thusly, changing the concentration of the hydrochloric acid. Results: 1st test Volume of Volume of Time taken for the sodium Hydrochloric acid (cm3) ...read more.

Conclusion

Sodium theosuphate Theosulphate to go opaque 10cm3 50cm3 19.29 seconds 8cm3 50cm3 20.36 seconds 6cm3 50cm3 24.51 seconds 4cm3 50cm3 26.93 seconds 2cm3 50cm3 29.33 seconds 3rd test Conclusion: My conclusion is that, the higher the concentration, the faster the rate of reaction, or the faster the sodium theosulphate will turn yellow and opaque. This matches my prediction. Evaluation: I think this experiment went well; there isn't anything I would change except maybe starting it with higher concentration of acid. There are no anomalous results to note ...read more.

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