Wednesday 8 June 2011

Effect of temperature - data


9. How to show that the experimentation was carried out as reported? (Evidence) Use of photograph, audio or recording.

Pouring freshly squeezed orange juice into a boiling tube.

Orange juice sample in fridge. (8 degrees Celcius)

Orange juice sample in room temperature. (30 degrees Celsius)

Taking the pH level of an orange juice sample.

10. How to organize and present the data collected? (Results)
1st experiment
Initial pH level of orange juice samples: 3.40
Elapsed Time (hours)
pH Level of Orange Juice Sample in Fridge (8°C)
pH Level of Orange Juice Sample in Room Temperature (30°C)
0
3.40
3.40
¼
3.41
3.42
½
3.42
3.45
¾
3.45
3.49
1
3.46
3.51
 
3.48
3.54
3.49
3.58
3.51
3.60
2
3.54
3.62
3.56
3.63
3.57
3.67
3.58
3.69
3
3.60
3.73



Initial pH level
pH level at the end of 3h
Change in pH level
Percentage of change in pH (%)
Sample of orange juice in fridge
3.40
3.60
+0.20
+5.88
Sample of orange juice in room temperature
3.40
3.73
+0.33
+9.71

2nd experiment
Initial pH level of orange juice samples: 3.34
Elapsed Time (hours)
pH Level of Orange Juice Sample in Fridge (8°C)
pH Level of Orange Juice Sample in Room Temperature (30°C)
0
3.34
3.34
¼
3.36
3.36
½
3.37
3.39
¾
3.38
3.41
1
3.40
3.44
 
3.42
3.48
3.45
3.50
3.46
3.53
2
3.48
3.55
3.51
3.60
3.52
3.63
3.54
3.65
3
3.57
3.69



Initial pH level
pH level at the end of 3h
Change in pH level
Percentage of change in pH (%)
Sample of orange juice in fridge
3.34
3.57
+0.23
+6.89
Sample of orange juice in room temperature
3.34
3.69
+0.35
+10.5

11. What do data mean? (Data Analysis)
The orange juice sample placed in the fridge was kept in 8°C while the sample outside in room temperature was kept at 30°C for 3 hours concurrently. From both experiments, we can see that the pH of both samples of orange juice increase over time. However, the pH level of the orange juice samples out in room temperature increase at a faster rate than the orange juice samples in the fridge. There is also a greater change (increase) in pH levels of the samples in room temperature at the end of 3 hours compared to the samples in the fridge. In the first experiment, the sample in room temperature experienced 3.83% more increase in pH compared to the sample in the fridge. In the second experiment, the orange juice in room temperature had 3.61% more increase in pH than the orange juice in the fridge.
This increase in pH level shows the rate at which the vitamin C content in the orange juice is degrading. This shows that vitamin C degrades faster in the orange juice when the juice is stored in warmer conditions. Also, since there were no other affecting factors to the change in pH level of the orange juice aside from difference in storage temperature, and the experiment was repeated and achieved similar results, it is safe to say that it is fairly accurate.

12. What can you deduce from the discussion of your data analysis? (Conclusion)
With this set of data, I can deduce that different storage temperatures affect the degradation of vitamin C in orange juice. The higher the temperature the orange juice is stored in, the faster the rate of degradation of the vitamin C content in the juice. This also means that the lower the temperature, the better the retention of vitamin C in orange juice, therefore proving my hypothesis right.

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