• Join over 1.2 million students every month
• Accelerate your learning by 29%
• Unlimited access from just £6.99 per month
Page
1. 1
1
2. 2
2
3. 3
3
4. 4
4
5. 5
5
6. 6
6

# Various Factors in the Preparation and cooking of Fruit and Vegetables can change the Vitamin C content. Devise and experiment one of those factors.

Extracts from this document...

Introduction

Various Factors in the Preparation and cooking of Fruit and Vegetables can change the Vitamin C content. Devise and experiment one of those factors. Pilot Method 1. Use a syringe (or Measuring Cylinder for measuring equal amounts) and pour out 10ml of DCPIP (Solution used to detect Vit.C) into a small beaker. 2. Using a separate Syringe, draw up 10ml of solution 0.1% Vitamin C 3. Slowly add the Vit.C into the DCPIP solution beaker, swirling around a few times. (swirling helps solutions to mix) 4. Continue to add the Vit.C until DCPIP turns a permanent straw colour. 5. Note the amount of Vit.C it took to change the colour of the DCPIP. 6. Repeat steps 1-5 5 3 times and take an average. Pilot Results Strength of DCPIP X Volume = Volume of Vit.C x Strength )( x 10ml = 8.5ml x 0.1% )( = 6ml x 0.1% 10ml Strength of DCPIP = 0.06 Strength of DCPIP X Volume = Volume of Vit.C x Strength )( x 10ml = 6ml x 0.1% )( = 6ml x 0.1% 10ml Strength of DCPIP = 0.06 Strength of DCPIP X Volume = Volume of Vit.C x Strength )( x 10ml = 6ml x 0.1% )( = 6ml x 0.1% 10ml Strength of DCPIP = 0.06 Average Strength of DCPIP = 0.06 Method 1. ...read more.

Middle

Compared with the other Juices (excluding juice one as it is pure Vitamin C) it takes less of this Juice to turn the DCPIP straw coloured (an average of 13ml). In comparison to the others there was not much difference between them all. The Pure Orange Juice with Pure Mango took an average of 14ml to turn the DCPIP straw coloured. After doing some research on the Vitamin content on different fruits, it was seen that both mangos and grapefruits, Mangos and Oranges are excellent vitamin C sources. Fruit Latin name mg vitamin C / 100 grams mg vitamin C per average size fruit/slice* Ranking Grapefruit Citrus paradisi 34 44* excellent Mango Mangifera indica 28 57 Excelent Orange Citrus sinenis 53 70 Excellent * The values are for one whole fruit, however not many would eat a whole medium sized watermelon at a sitting, so for these larger fruit the value is for a slice, a 'slice' being, very generally, about an eighth of a medium sized fruit, or a quarter of a 'smaller' fruit. In the particular case of lemon and lime, the 'slice' value is juice of one wedge. For a few small fruit, such as Kei apple, the ranking is adjusted upward where the fruit mg/100 gram analysis shows it has large amounts of vitamin C, but the small size of the fruit gives it a lower per fruit vitamin C content. ...read more.

Conclusion

Making sure that the same method was used at all stages could have rectified this. This would have ensured that all the figures were reliable. Another problem that could have caused results to be unreliable is the readings that were taken. The syringes that were used had markings that went up in 5's. It's possible that the reading were not done very accurate and not made at their actual point. If this problem were consistent all of the readings would have been inaccurate. By having the same person doing the readings and also having used a syringe that has more reading points would have made them more accurate in that the individual points would have been easier to read. Another possible problem that was seen was the fact that the aim was to look for colour changes. It would not have been able to come to a sure conclusion of what was straw colour and what was not. It would have not been able to come to a sure mark of straw coloured. There would not no real solution to this problem as it would be dependant on the person. The only solution that could minimise this problem would be to have the same person making the judgments, as their perception of Straw coloured would be the same. Apart from the above points the investigation was went well and was carried out smoothly. The team were able to conclude the investigation with the use of gained figures and reactions. ...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 Physical Chemistry 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

# Related AS and A Level Physical Chemistry essays

1. ## Analysis of commercial vitamin C tablets

1.05 Volume of Na2S2O3 /cm3 29.55 29.85 29.75 Average volume of Na2S2O3 added /cm3 29.80 ? Concentration of standard Na2S2O3 solution = 1.910152x10-3 � (29.8 x 10-3) M = 0.064099 M The table below shows the determination of I2 which is not reduced by ascorbic acid by titration with standard

2. ## Analysis of commercial vitamin C tablets

of mole of Na2S2O3(aq) titrated=MV =0.099415887x(14.45/1000) =0.001436559567mol ?No. of mole of I2 reacted with Na2S2O3(aq)= No. of mole of Na2S2O3(aq) titrated/2 =0.001436559567/2 =0.0007182797836mol ?No. of mole of I2 reacted with 10cm3 vitamin C(Ascorbic acid)

1. ## Investigation to analyse some fruit and vegetable juices for the contents present in them.

are present in their juices. With this idea in mind, the project has been undertaken. AIM - To analyse some fruit and vegetable juices for the contents present in them. APPARATUS - Test tubes, burner, litmus paper, beaker, tripod stand, conical flasks, burette, pipette.

2. ## Determination of the content of Mg (OH)2 in an indigestion remedy by back titration ...

Various volumes (3.75cm3 , 0.80cm3 and 1.5 cm3 ) of NaOH were used at 0.5 M concentration. 2. (3.75cm3 /1000) x 0.5 mol dm-3 = 1.875 x 10-3 mol (NaOH used) 3. (0.80cm3/1000) x 0.5 mol dm-3 = 4 X 10-4 mol (NaOH used)

1. ## Analysis of Commercial Vitamin C Tablets

Pipette 25.0 cm3 of the standard KIO3(aq) into the flask containing vitamin C and KI(aq). 8. Titrate the iodine content immediately with the standardized Na2S2O3(aq). Record your results in Table 2. Results : Mass of the Vitamin C Tablet used = _________4.58______________ g Mass of weighing bottle & potassium iodate(V)

2. ## Aim:To investigate the content of vitamin C (ascorbic acid) content in a commercial tablets ...

25.00of the potassium iodate solution was transferred into a conical flask using a pipette, then about 5cm of 1M KI was added followed bt 5-10.It was immediately titrated with sodium thiosulphate solution. 3. 10drops of freshly prepared starch solution was added when the reaction mixture turns pale yellow and titrated continuously until the reaction mixture turn colourless 4.

1. ## AQA As Applied Science Unit 3. Colorimetry experiment on Ribena juices

May also be used and placed right as if it is places on the edge it could fall and hurt someone. If myself or anyone else was to get hurt due to any shock then I will call for help immediately and rush to first aid as this could be very dangerous.

2. ## Determination of the Concentration of Acid in Gastric Juice

Bags should be left outside as they are an obstruction and a safety hazard. Risk Assessment Chemical Hazard Control measure Sodium hydroxide Causes severe burns. Very dangerous to the eyes and skin. Solutions equal to or stronger than 0.5 M should be labelled CORROSIVE.

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