An Investigation into how the concentration of a solution affects the rate of a reaction
Background Knowledge
I know of a way that the concentration of a solution affects the rate of a reaction. When putting dirty clothes to the wash, the more tablets you us the higher the concentration which means the stains are removed quicker. The concentrated washing powder solution sped up the reaction.
Plan
I am going to investigate the reaction below:
The same person is going to take the time and the same person is going to check each time when the X cannot be seen.
Apparatus
- A conical flask
- 2 measuring cylinders
- 3 beakers
- Hydrochloric Acid
- Sodium Thiosulphate
- Water
- A stop watch
Diagram
Method
- For the first calculation I will fill the conical flask with 50 ml of Sodium Thiosulphate and 10ml Hydrochloric acid.
- There will be an X wrote in pencil on a piece of paper under the conical flask.
- When the acid is poured in with Sodium Thiosulphate the stop clock begins.
- When you can no longer see the X through the beaker you stop the clock.
- You then record the time.
- Wash out the conical flask ready for the next reaction, so there is no contamination from the previous one.
- For the second reaction fill a measuring cylinder with 45ml Sodium Thiosulphate and 5ml water.
- Add 10ml hydrochloric acid and then repeat the experiment.
- Go on to the next reactions.
- The third reaction would be 40ml Sodium Thiosulphate and 10ml hydrochloric acid and so on.
- 10ml of hydrochloric acid must be added each time.
- Do this twice for each one.
