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This experiment's title is: "investigate how the concentration of Sodium Thiosulphate affects the rate of reaction between Sodium Thiosulphate and Hydrochloric Acid".

Extracts from this document...

Introduction

GCSE Chemistry Coursework 1. Title of Investigation This experiment's title is: "investigate how the concentration of Sodium Thiosulphate affects the rate of reaction between Sodium Thiosulphate and Hydrochloric Acid". 2. Background to Investigation * Whilst performing an experiment where some Sodium Thiosulphate (Na2S203) and Hydrochloric Acid (HCl) were mixed together, it was noticed that, they reacted together to form a cloudy solution. * Hence, we decided to investigate how the concentration of the Sodium Thiosulphate affects the rate of the reaction between Sodium Thiosulphate and Hydrochloric Acid. - When the two chemicals are combined the mixture gradually turning cloudy will make the "x" disappear. 3. Planning 3.1 Safety Whilst performing this experiment there are a number of safety procedures which must be adhered to: * Safety goggles must be worn, as Hydrochloric acid is extremely corrosive. * All schoolbags etc. should be out of the way, so nobody trips over them. * Blazers should be removed and ties tucked in. * Any spillages, should be reported to the teacher. 3.2 Variables There are many different variables which I must be aware of throughout this experiment: 3.2.1 Independent Variable This will be the concentration of the Sodium Thiosulphate and will be changed throughout the experiment. ...read more.

Middle

(cm3) (cm3) (cm3) 5 3.125 48.875 10 10 6.250 43.750 10 20 12.500 37.500 10 40 25.000 25.000 10 80 50.000 0.000 10 * In order to make the Sodium Thiosulphate more dilute measured amounts of water will be added to it (the amounts are shown in the table above) before the HCl is added. * For smaller volumes of Sodium Thiosulphate, we will double the amount measured out. So, instead of 50cm3 of Sodium Thiosulphate and water solution being measured, 100cm3 will be measured out. This is so that we can measure the Sodium Thiosulphate accurately. 3.5.2 Repeat Readings * To ensure fair and accurate results, I will take two separate readings for each concentration of Sodium Thiosulphate, an average will then be calculated and placed in the final result table.. * If the two readings vary by a substantial amount of time (possibly due to human error) . I will take a third reading and discard the most inaccurate result. 3.5.3 Processing Results * The table into which I will place my results is shown below: Concentration Of Na2S2O3 (g/dm3) ...read more.

Conclusion

This meant that the measurements were not entirely accurate, hence the final results were not as accurate as they could have been. In order to improve this, we could have used more sophisticated apparatus to measure the volumes and to time how long the " x" takes to disappear. For example: a syringe, or other more accurate apparatus to measure the smaller volumes. * We could also have chosen an easier dependent variable to measure. This is because it was nearly impossible to determine exactly when the "x" disappeared using the human eye. Either this or a more sophisticated system of determining when the "x" disappeared such as a camcorder fitted to a pc could have been used. 4.6.2 Execution of Experimental Procedure * In my opinion, I feel that under the circumstances and restraints of the simple equipment used the experiment was preformed extremely well. Using a larger volume of the solution than required as we did made it far easier to measure out the smaller volumes of Sodium Thiosulphate therefore enabling us to obtain more accurate results. Overall, as there was only one major anomaly over both of the graphs I feel that our experiment was a success. ...read more.

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