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The Effect of Concentration on the Reaction between Sodium Thiosulphate and Hydrochloric Acid.

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Introduction

The Effect of Concentration on the Reaction between Sodium Thiosulphate and Hydrochloric Acid. We are given 2md/dm� of Hydrochloric Acid = 10cm�. We are also given the measurement of Sodium Thiosulphate solution: 40g/dm� = 50cm� The chemical equation for this reaction is: 2Hcl + Na�S�O� 2NaCl + H�O + SO� + S I am going to investigate the effect of concentration in this reaction. To do this I will change the volume of 0.1 mol/dm� of sodium Thiosulphate. We will keep the amount of Hcl the same, because if we altar that one it will totally change the results and there would be no pattern. We learned that if the concentration doubles, the rate doubles. I will therefore choose the dilute sodium Thiosulphate to prove this and to see if it affects the rate of the reaction. ...read more.

Middle

The amount of hydrochloric acid will stay the same through the whole experiment. This is a table to show the volume of sodium Thiosulphate, water and hydrochloric acid I will use: Volume of 40g mole/dm� of sodium Thiosulphate solution (cm�) Volume of water (cm�) Volume of Hydrochloric acid (cm�) 50 0 10 40 10 10 30 20 10 20 30 10 10 40 10 0 50 10 After having my results (after I will have done the experiment) I will be bale to see a pattern, I think that it will take longer for the cross to disappear when the amount of sodium Thiosulphate decreases. To do the experiment we will work as safely as possible, have goggles and overcoats. We did the experiment as shown in the planning and these are my results (we did a repeat of the experiment): Results 1: Volume of 40g mole/dm� of sodium Thiosulphate solution (cm�) ...read more.

Conclusion

The less concentrated the solution is the slowest the reaction goes, because if its more concentrated then there are more molecules (of Thiosulphate), meaning that it would be more likely for the acid molecules to hit the sodium Thiosulphate molecules. I think that the evidence was good because I did all of my experiments in one lesson so there was no interfering with any of my results and I also cleaned my flasks after each experiment and measured everything making sure I used a different measuring cylinder for each different solution so that they did not mix. Therefore you can see that my prediction was right and that concentration does affect the reaction, with sodium Thiosulphate and water and hydrochloric acid you could see that the less concentrated the Sodium Thiosulphate is the slower the reaction goes. Elke Mahy 11B Chemistry Coursework ...read more.

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