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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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
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Method

  1. Pour 15ml of vitamin c indicator into 50 ml conical flask
  2. Using clean pipette (Clean by rinsing in dist water), add a drop of one of the orange juice samples to the conical flask with indicator present. Gently swirly to mix the solution
  3. Continue to add the sample of juice to the flask drop by drop, until the indicator changes from blue to colourless.

NOTE: SWIRL AFTER EACH DROP ADDED:

  1. Observe and count the number of drops of orange juice you needed to add to the conical flask to ...

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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.

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.

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.