Rates of Reaction

Prediction: I predict that the lower the concentration the more time it will take to react.

Sodium Thicsulphate Solution

Distilled

Water

Concentration Dm3

(moles)

50

0

0.1

40

0

0.08

30

20

0.06

20

30

0.04

0

40

0.02

Method:

The table above shows how you make up the concentration.

. Mix sodium thicsulphate solution with distilled water as the table shows.

2. We measure using measuring cylinders. 500cm3 sodium thicsulphate and 5cm3 of distilled water need to be measured.

3. When it's done use 5cm3 hydrochloric acid in the conical flask with the sodium thicsulphate.

4. When the reaction begins one person has to observe the conical flask and the other person uses the stopwatch.

5. The person observes the conical flask until they can't see the X anymore.

6. When they can't you stop the stopwatch and record your results.

7. Repeat the experiment 3 times with the remaining concentrations.

Rates of Reaction - Results Table

Concentration Dm3

(Sec)

2 (Sec)

Average (Sec)

0.1

43.17

52.24

47.705

0.08

81.34

63.78

72.56

0.06

84.27

95.14

89.705

0.04

44.41

75.36

59.885

0.02

241.29

273.83

257.56

Analysis

The less the concentration, the more time it takes to react.

If the concentration is lower the particles will collide less and it will take longer to react because there are less particles.

My prediction was correct.

Evaluation

. The procedure I carried out wasn't exactly right because there was an anomaly in my results.

2. Yes there was an anomaly, it was at 0.06 concentration.

3. I might have got the anomaly because I may have put in less concentration or I added it to conical flask which still had some other different concentration in it.

4. Next time I do this experiment, I should check that I mix all the concentrations properly and make sure I clean out the conical flask properly after each concentration, this will give me a better chance of not getting anomalies.

Conclusion:

My results tell me that that the lower the Concentration in Dm3 the longer the reaction will take place, and the higher the concentration the quicker the reaction will take place. This was my prediction and this means my prediction is correct. My results did contain an anomaly so to make it a fair test next time I will re-do the test three times at a minimum, this will make me sure I don't get any anomalies and I can also get an average result for each amount of concentration. The changing variable in this experiment was the concentration of the solution.