How the change of temperature affects the rate the jelly dissolves.

* Thermometer

* Bunsen burner

* Gauze

* Tri-stand

* Thermal mat

* Jelly (2cm² x 12)

* Stop watch

* Polystyrene

Method

Collect a 250ml beaker and fill with 150ml of water and heat to the correct temperature. I will start with 80°C followed by 75°C and continue to decrease by 5°C until it reaches 60°C. next place a piece of jelly, 2cm² straight away into the water. I will cover the beaker with a piece of polystyrene. From the moment the jelly enters the water I will start my stopwatch and stop it when I believe the jelly has dissolved. Throughout my experiment I will stir moderately with the thermometer. Additionally at the end of each experiment I will take the finishing temperature. This will allow me to find the average temperature of the experiment, as room temperature is much lower and will interfere with my experiment. For each experiment I will repeat it three times, which will allow me to find a mean as a result instead of relying one just which could be very inaccurate.

Thermometer

Jelly

H2O

+ Stop Watch

HEAT

Fair test

So that my experiments are fair I will keep the size and type of the jelly the same and the amount of water I use. This is because the variables could affect the out come of my results.

Results

Beginning temperature

Time1

Time2

Finishing temperature1

85

31.1

30.19

80

80

32.1

34.35

75

75

34.41

39.12

70

70

48.6

48.22

66

65

64.47

63

63

60

73.5

63.72

56

Finishing temperature2

Average temperature1

Average temperature2

Average time1

81

82.5

83

30.7

76

77.5

78

33.2

70

72.5

72.5

36.8

67

68

68.5

48.4

61

64

66

63.7

58

58

59

73.6

Conclusion

My graph shows that the higher the temperature the faster the solute dissolves and proves that my prediction is correct. From looking at my results and especially my graphs and can see that some are inaccurate, these are highlighted. Human error, for example stirring slightly differently or maybe that could have caused these results to be differently. Additionally I had to change some details in my method, as there weren't the resources. I was unable to use polystyrene, which meant that I lost more heat than I could afford to in my investigation. Furthermore I had to use a kettle and mix cold water and hot instead of a Bunsen burner.

If I did my experiment again I would take more to time to get more accurate results. Maybe repeat each one ten times, placing polystyrene over the top to insulate the heat and use a Bunsen burner at get a more accurate temperature to start off my experiments.