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Objectives/Aims To measure and compare the amount of Vitamin C in various juices. To determine the effect of various factors on Vitamin C

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Introduction

Vitamin C in juices and the factors which changed It? Objectives/Aims 1. To measure and compare the amount of Vitamin C in various juices. 2. To determine the affect of various factors on Vitamin C Hypothesis 1. I predict that hand squeezed juice will contain more Vitamin C as it is fresh Independent/dependant variables * Dependant variable - the amount of Vitamin C indicator (DCPIP) * Independent variable - the amount of Vitamin C present in juice Apparatus' Sources * Vitamin C indicator solution Freshly squeezed orange juice * 3 plastic pipettes Bottled Juices Orange * One 20ml Graduated cylinder * Three 50 ml Conical flasks * One stirring rod * Results table * Distilled water If available Method 1. ...read more.

Middle

If this occurs, indicate that no satisfactory end point was reached. Record the numbers of drops added to the result table. 5. Repeat this procedure for all the sample of juice NOTE: RINSE ALL EQUIENT IN DIST WATER TO BE SURE OF NO CONTAMINATION. Results table: Vitamin C Content in Juice Type of Juice Number of drops needed to change indicator colourless Hand Squeezed 10 Carton Orange 18 Squash 50+ Ready Squeezed 12 To gain more accurate and reliable final results take each Groups data and find the average to give best results. All the data from each group Type of Juice Number of drops needed to change indicator colourless Hand Squeezed 10, 11, 9, 10, 12 Carton Orange 18,19,22,17,18 Squash 50+, 50+,50+,52, 45 Ready Squeezed 12,10,11,14,13 Averaged Data Type of ...read more.

Conclusion

The graph is reliable due to the fact all the classes data was used Evaluation. This experiment produced reasonably clear results, however to ensure that the results are valid it would be a good idea to repeat the experiment with several more varied types of juice. We could gain more accurate result by doing the experiment via titration this way you can take more accurate readings. (Indicator in conical flask juice in burette) Also values should not of been rounded up as it effects the results table slightly. For future experiments could be carried out by using pure vitamin c, then result from juices can be compared with pure vitamin c this would further prove my hypothesis. The indicator could also be changed due to the fact that reaching an endpoint can be varied. ...read more.

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Here's what a star student thought of this essay

3 star(s)

Response to the question

Overall a mediocre response to the question. The results and scientific reasoning behind the experiment are quite poorly explained, although the conclusion from the graph is adequate for what the results show. The graphs and results table are poorly constructed ...

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Response to the question

Overall a mediocre response to the question. The results and scientific reasoning behind the experiment are quite poorly explained, although the conclusion from the graph is adequate for what the results show. The graphs and results table are poorly constructed and the candidate could easily have improved their mark by taking more time with their work.

Level of analysis

The candidate does not explain the scientific reasoning behind their hypothesis. The results tables used are quite poorly constructed, and should have different columns signalling the number of repeats, also the indicator used was not very good, as to note the change of colour indicator in the colour orange could be quite hard to notice subtle changes. No control was used, and there could have been many more scientific improvements suggested for this experiment.

Quality of writing

Plural of juices is not correct. Punctuation misses full stops that are needed in some areas. Apparatus is also wrongly punctuated. Spelling mistakes seen in places that could have been avoided by simple proof-reading.


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Reviewed by skatealexia 15/04/2012

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