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Hydrochloric Acid with Sodium Thiosulphate Investigation

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Introduction

Write-up of the Experiment Introduction A reaction can be made to go faster or slower by changing the concentration of a reactant. If a solution is made more concentrated it means there are more particles of reactant knocking about between the water molecules which make collisions between the important particles more likely. Aim The aim of this experiment is to find out how fast the reaction will be between Sodium Thiosulphate solution and Hydrochloric Acid when different concentrations of the acid are added. This will determine the effect of concentration on the speed of a reaction. Method > 50cm� of Sodium Thiosulphate was poured into four conical flasks. > In the first conical flask, 0.25M of 50cm� of Dilute Hydrochloric Acid was poured. ...read more.

Middle

4 minutes and 14 seconds 254 seconds The results for the second round of experiments: Experiment Time Time in Seconds Flask 1 (0.25M of 50cm� of Dilute Hydrochloric Acid with Sodium Thiosulphate) 15 minutes and 37 seconds 937 seconds Flask 2 (0.5M of 50cm� of Dilute Hydrochloric Acid with Sodium Thiosulphate) 8 minutes and 56 seconds 536 seconds Flask 3 (1M of 50cm� of Dilute Hydrochloric Acid with Sodium Thiosulphate) 5 minutes and 9 seconds 309 seconds Flask 4 (2M of 50cm� of Dilute Hydrochloric Acid with Sodium Thiosulphate) 4 minutes and 7 seconds 247 seconds Average Results: Experiment Average Time Average Time in Seconds Flask 1 (0.25M of 50cm� of Hydrochloric Acid with Sodium Thiosulphate) 15 minutes and 41.5 seconds 941.5 seconds Flask 2 (0.5M of 50cm� of Hydrochloric Acid with Sodium Thiosulphate) ...read more.

Conclusion

Therefore this proves that the acid needs to be more concentrated if the reaction is to be fast. The theory behind particles in reactions helps to explain why. Increasing the concentration of substance in a solution means that there will be more particles per cm� of the substance. The more particles that there are, the more will collide per second and so the rate of reaction increases. The diagram below contributes to the explanation: Low Concentration High Concentration If the concentration is doubled then the amount of time would be halved. Conclusion These experiments show that a reaction goes faster when the concentration of a reactant is increased. The rate increases when the concentration of acid is doubled. Therefore, if the concentration of acid is doubled the time halves. My results, therefore, confirm my original prediction that the more concentrated the acid is the quicker the reaction would be. ...read more.

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