• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Vitamin C concentration

Extracts from this document...


Which type of fruit juice provides the most vitamin C? The quantity of vitamin C in food and drink can be determined using a simple colour test. Vitamin C decolourises the blue dye DCPIP (dichlorophenolindolphenol). Vitamin C is an antioxidant and reduces the DCPIP. DCPIP changes from blue to colourless (or slightly pink) as it becomes reduced. We will be testing a range of different fruit juices to see which contains the highest concentration of vitamin C I predict that the fruit juice with the highest concentration of vitamin C will be orange juice, as it is the most widely publicized as having a high vitamin C content. Method Apparatus; Range of fruit and/or fruit juices Standard 1% vitamin C solution DCPIP 0.1% Pipette, syringe or burette to measure volumes accurately Standard laboratory glassware and apparatus To begin with, 1cm� of DCPIP each fruit juice will be measured into separate test tubes and placed in a test tube rack, a burette is then placed in a clamp and filled with each fruit juice. ...read more.


Safety goggles Breaking glass 2 4 8 Take care Spilling chemicals on clothing 1 5 5 Science overalls Results My results Repeat 1 (cm�) Repeat 2 (cm�) Repeat 3 (cm�) Repeat 4 (cm�) Average (cm�) 1% vitamin C solution 0.50 0.50 1.00 0.50 0.50 Orange 0.40 0.40 0.60 0.30 0.36 Apple 0.70 0.20 0.50 0.40 0.45 Grapefruit 0.10 0.20 0.20 0.20 0.175 We pooled together all the results from each group to get a better data range, the below table includes the data from each group's experiment. As you can see, the trend in the data of the entire group is much the same as ours, grapefruit having the least amount of juice required to decolourise the DCPIP and vitamin C solution having the most. There were a number of outliers in the results, most notably the first apple juice result, this was most probably due to human error in titrating the juice Group Averages Group 1 (cm�) Group 2 (cm�) Group 3 (cm�) Group 4 (cm�) Average (cm�) 1% vitamin C solution 0.67 0.83 0.50 0.50 0.625 Orange 0.53 0.43 0.36 0.56 0.47 Apple 1.10 0.30 0.45 0.33 0.36 Grapefruit 0.37 0.23 ...read more.


= 6.25mg of Vitamin C to decolourise the DCPIP solution. There is exactly 6.25mg of vit c in the volume of each fruit juice put in, i.e in the 0.45cm3 of apple juice mixed with DCPIP there is 6.25mg of Vitamin C. I must then work out the concentration of vitamin c in each fruit juice to then compare them with each other. Concentration (mg/cm3)= amount (6.25)/ volume. Fruit Juice Volume (cm3) Concentration (mg/cm3) 1% Vitamin C solution 0.625 10.00 Apple Juice 0.36 17.36 Orange Juice 0.47 13.80 Grapefruit Juice 0.31 35.71 The most concentrated fruit juice in mg/cm3 is clearly the grapefruit juice. The experiment has produced overall a reliable set of results as most drinks cartons tell us that grapefruit is high in vitamin c and our results help prove this. I do not think that any more accurate apparatus could have been used in this, as far as accurate equipment goes, a burette is the best. I do not think that any extraneous factors were large enough to affect the results to a substantial degree so I believe the data to be valid and reliable as we controlled most things that may have affected it. ?? ?? ?? ?? Taylor Hayes VPr Biology- Unit 1 Core Practical Two ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our AS and A Level Energy, Respiration & the Environment section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related AS and A Level Energy, Respiration & the Environment essays

  1. Marked by a teacher

    Effect of nitrate concentration on the growth of Duckweeds

    5 star(s)

    Trend A on the graph is between 0%-0.4% x 10-3 concentration of nitrates in solution, this trend shows a rapid increase in growth of duckweeds (increase in the number of fronds) as the concentration of nitrates increases. This increase in trend A lasts until the growth of the fronds reaches

  2. Investigate the effect of bile salt concentration on the digestion of milk by the ...

    Allow the pH probe to take readings for 120 seconds. The length of the experiment has to be the same each time to ensure a fair test. Repeat for the same concentration and other concentrations of bile salts. The experiment should be repeated three times for each concentration.

  1. the effect of bile concentration on the activity of the enzyme lipase during the ...

    Apparatus Apparatus What is it used for? Reason for choice? Volumetric flask Dilutions of the bile salts Accurate way to dilute the bile salts as opposed to conical flask because apparatus has an accuracy of +/-0.05cm3. In addition to this its precise since it has only one graduation mark so

  2. Investigating the effects of Sodium Hydroxide concentration on Catalase

    10 20 13 25 10 12 24 15.3 30 11 15 25 17 35 11 17 26 18 40 20 18 27 22.3 45 25 19 28 24 50 28 20 29 25.6 55 29 27 30 28.6 60 30 30 30 30 65 31 31 31 37 70 31

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work