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# An investigation of the rate of reaction between Sodium Thiosulphate solution and Dilute Hydrochloric acid.

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Introduction

An investigation of the rate of reaction between Sodium Thiosulphate solution and Dilute Hydrochloric acid. What I am trying to find out is that if the reaction time increases when the concentration of Thiosulphate is at different volumes. Method To insure that my experiment is a fair test I will not use the same measuring cylinders for the Hydrochloric acid and the Sodium Thiosulphate. The total volume of my experiment will be 60cm�, in that there will always be 10cm� of Hydrochloric acid this will stay the same through out the experiment and then the other 50cm� will be a concentration of the water and Sodium Thiosulphate. 1) Poor the Thiosulphate solution into a conical flask 2) Put the conical flask on the paper with the black cross 3) Then add the Dilute Hydrochloric acid and start the stop watch 4) When you can no longer see the black cross stop the stop watch 5) Record the time on results table Acid cm� Thiosulphate cm� Water cm� Total cm� 10 50 0 60 10 40 10 60 10 30 20 60 10 25 25 60 10 20 30 ...read more.

Middle

and the Internet I found out that: for a reaction to take place the particles must collide together. On top of that both particles must have enough energy to react. 1) 2) 3) Water particles Hydrochloric acid Magnesium 1) In a liquid the particles move round freely. An acid particle is about to collide with the magnesium. 2) If the two particles have enough energy there will be a reaction. This will make magnesium chloride and hydrogen. 3) If the two particles don't have enough energy to react they will just bounce and move in opposite directions. If the I change the concentration of the acid is increased the it would look like this: 1) In this one there are more water particles than acid particles. So this that there is not much chance of the acid colliding with the magnesium. It is less concentrated. 2) In this one there are more acid particles. So it is more concentrated. As there is more acid there is a higher chance of a reaction. ...read more.

Conclusion

Average reaction time Thiosulphate Cm� Time/sec average 50 35 1.4 40 37 1.0 30 52 0.5 25 67 0.3 20 89 0.2 10 203 0.0 Evaluation The experiment was under control at all time there were unexpected results. The results from the experiment did match my prediction, the reaction time did get longer when the concentration got larger. In my experiment they're not any anomalous points. Everything went to plan, there were no problems. I could have made the experiment better by using better and more exact measuring cylinders. I could have altered the experiment by changing the temperature to see if the temperature varies the reaction time. I could have improved the experiment by tacking reading every 5cm� instead of every ten like I did. This would have given me a wider range of results so it would have been more accurate. From this experiment I have found out that if you change the concentration of Thiosulphate it will increase the time it reacts in. This experiment could have been done with temperature and it could have changed the reaction time. Sir I am not too happy with my final version so when you mark it could I have it back to improve and hand again please. ...read more.

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1. ## Rates of Reaction

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