PREDICTION: I predict that the higher the temperature of the Thiosuphate, the less time it will take for the dilute acid to react.
EQUIPMENT:
- 2 measuring cylinders
- 1 beaker
- Tripod
- Bunsen Burner
- Heatproof Mat
- Stirrer
- Thiosulphate solution
- Dilute Acid
- Thermometer
- Hydrochloric Acid
- Timer
DIAGRAM:
VARIABLES:
- The rate that the temperature effects the speed of the reaction.
- The level of concentration of the Hydrochloric Acid
- The level of concentration of the Thiosulphate solution
FAIR TEST: To make my experiment fair, I will make the following procedures:-
- Make sure the amount of thiosulphate solution stays the same (50 cl)
- Make sure the amount of Hydrochloric acid stays the same (5cl)
- Once the acid has been added to the thiosulphate, make sure to stir the solution exactly 5 times each time I do the experiments.
- I will repeat each experiment twice to make my result more accurate.
Prior to my prediction, I think that the higher the temperature of the thiosulphate, the quicker the acid will react. This is because as more heat energy is put into the solution, the particles of the thiosulphate move faster resulting in various collisions. If the particles collide fast enough, there will be a reaction therefore if the temperature is high, the particles are colliding faster which will bring the rate of reaction quicker.
RESULTS:
EVALUATING EVIDENCE:
I think my experiment was quite successfully done because the method used was fairly adequate. It provided us with the results that we needed and the actual method was fairly easy to do and understand. The only thing that I thought was not very good was the fact that the experiment took too long to do-another method may have taken less time.
In the end, I got plenty of results from my experiment which overall were very useful as they provided a wide range of evidence from which I could get a good result from. I noticed a a pattern from these results because as I increased the temperature of the thiosulphate, the quicker it got for the solution (when hydrochloric acid was added) to go cloudy until the cross underneath was no longer visible.
In my opinion, I think I was fairly accurate during my experiment as each time I increased the temperature of the thiosulphate, I made sure that my readings of the thermometer were exact and when measuring out the acid, I made sure I measured out the right amount. I timed how long it took for the cross to disappear fairly accurately and I made sure that the solution(once the acid was added) was stirred only 5 times.
In the end, there were not any anomalous results because I repeated the experiment twice to be more accurate.
To improve this experiment, I could have used better experiment for example: Digital thermometers etc. Also, I could have benefited from doing the experiment all in one go rather than splitting it up into two days as this could have affected my results.
In my opinion, I think that my results were reliable because I repeated the experiment and all my results were almost the same each time except for a few. If someone else was to repeat my experiment, I think that there results would have been the same as mine because this experiment is fairly straight forward and if you follow the method carefully, you cannot go wrong.
Finally, I think there were plenty of results to support my conclusion as I have been able to get an adequate result from doing this experiment.
