Investigating the Effect of Concentration on Reaction Rate

Introduction:In this experiment the effect of concentration on the rate of reaction between sodium thiosulfate and hydrochloric acid is investigated

Equipment: A conical flask measuring cylinder stopwatch black cross on the paper 0.2 mol L-1 sodium thiosulfate 1.0 mol L-1 hydrocholric acid

Method

1. Put the piece of paper with the X on the bench and put the conical flask on it.
   
2. Measure 10mL of Sodium Thiosulfate and put it into the conical flask.
3. Measure 40mL of Water and put it into the conical flask. Swirl to mix.
4. Measure 5mL of HCl.
5. Pour the Sodium Thiosulfate into the conical flask, start the timer and swirl the flask.
6. Stop timing when the you can't see the cross on the paper.
   
7. Wash out the flask thoroughly.
8. Repeat experiment 20mL of Sodium Thiosulfate and 30mL of Water.
9. Repeat experiment 30mL of Sodium Thiosulfate and 20mL of Water.
10. Repeat experiment 40mL of Sodium Thiosulfate and 10mL of Water.
11. Repeat experiment 50mL of Sodium Thiosulfate and no Water  

RESULTS

10ml of sodium thiosulfate/40ml of water 4min 43 seconds

20ml of sodium thiosulfate/30ml of water 2 minutes

30ml of sodium thiosulfate/20ml of water 54.63 seconds

40ml sodium thiosulfate/10ml of water 44.22 seconds

50ml of sodium thiosulfate/no water 33.62 seconds

Conclusion
In conclusion the more concentrated the chemicals  the the faster the chemicl reaction takes place