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OBJECTIVE:DETECT THE PRESENCE OF VITAMIN C IN DIFFERENT SUBSTANCES.
MATERIALS:3 beakers; 3 Petri's dishes; dropper; spoon.
Concentrated starch suspension in water; lemon juice; vitamin Ccomplex; synthetic juice; iodine solution.
PROCEDURE:*Put, in each Petri's dish, equalamounts of starch suspension; then add equal amounts of iodinesolution in each one.
*In one of the dishes, add vitamin C complex (which have been dissolved in water previously), recording the amount of drops, which are needed for the iodine solution, in the starch suspension, to tern white.
*Repeat the same procedure with the lemon juice and with the synthetic juice (which have been dissolved in water previously).
NOTE: the vitamin C complex and the synthetic juice should be dissolved in water and the lemon should be squeeze just before the investigation is carried out, for vitamin C may denature when oxygen is present.
RESULTS:The following results were recorded:
Drops1
Vitamin C complex1
Lemon juice12
Synthetic juice130
NOTE1: less than a drop of vitamin C complex may have been necessary for the iodine-starch solution to tern milky.
NOTE2: 130 drops of synthetic juice were needed for rather few changes to occur in the colour of the iodine-starch solution, but were not enough for the solution, to tern completely white.
1Drops needed for the iodine-starch solution to tern milky.
CONCLUSION:After adding iodine solution over the starch suspension, it varied to blue-violate; vitamin C decolorize this preparation, by "masking" the iodine.
As it is shown in the results, it was only needed one drop of vitamin C complex for the iodine-starch preparation to tern white (decolorize); however, for the lemon juice 12 drops were needed and for the synthetic juice 130.
From the results, we may say that the amount of vitamin C contained in the vitamin C complex is far higher than the amount in lemon juice (vitamin C complex has 2000 mg. of vitamin per portion, while a portion of lemon contains just about 40 mg.)
INVESTIGATION Nº2
OBJECTIVE:INVESTIGATE THE EFFECT OF HEAT OVER VITAMIN C.
MATERIALS:2 beakers; 2 Petri's dishes; dropper; spoon; Bunsen burner
Concentrated starch suspension in water; lemon juice; vitamin Ccomplex; iodine solution
PROCEDURE:*Put, in each Petri's dish, equal amounts of starch suspension; then add equal amounts of iodine solution on each one.
*Boil the dissolved vitamin C complex and the lemon juice
*In one of the dishes, add vitamin C complex, recording the amount of drops, which are needed for the iodine solution, in the starch suspension, to tern white.
*Repeat the same procedure with the lemon juice (this investigation was not carried out with the synthetic juice, for it would have been necessary a huge amounts of drops)
RESULTS:The following results were recorded:
Drops1
Vitamin C complex8
Lemon juice30
1Drops needed for the iodine-starch solution to tern milky.
CONCLUSION:After adding iodine solution over the starch suspension, it varied to blue-violate; vitamin C decolorize this preparation, by "masking" the iodine.
As it is shown in the results, 8 drops of vitamin C complex and 30 drops of lemon juice were needed for the iodine-starch preparation to tern white (decolorize). If we compare these results with those in INVESTIGATION Nº1, we may notice that much more drops from each boiled substance were needed for the iodine-starchsolution to tern milky.
From the results, we may say that heat denature vitamin C; this mean that the vitamin loses its chemical characteristics when it's in height-temperature conditions.
What else can I help you with?
Which nutrient is correctly paired with the indicator used to detect its presence?
Vitamin C - iodine solution is the indicator commonly used to detect the presence of vitamin C due to the color change reaction that occurs.
What is the function of dcpip solution?
DCPIP solution is used as a redox indicator to detect the presence of vitamin C (ascorbic acid) in various substances. When vitamin C is present, it reduces the blue DCPIP solution to a colorless solution, indicating the presence of the vitamin. This is a common method used to measure the vitamin C content in food and supplements.
How do you test an apple for vitamin C?
1. Crush the apple and shake it in warm water to extract the soluble substances 2. Take some of the water that had the apple in it and add it to 2cm3 of a 0.1% solution of DCIP (a blue dye) 3. If vitamin C is present, the blue dye will go colourless
What medication can you take to treat vitamin c deficiency?
take vitamin c tablets, eat oranges and other high vitamin c foods
What foods are good for your teeth and bones?
foods rich in vitamin c
Is vitamin C considered food?
Raw vitamin, no. Foods that contain it, yes.
What chemical would you use to confirm the presence of vitamin C?
To confirm the presence of vitamin C (ascorbic acid), you can use a solution of iodine. When iodine is added to a sample containing vitamin C, it will react and become decolorized, indicating the presence of vitamin C. This reaction occurs because vitamin C reduces iodine, turning it from a brownish color to clear. A titration method can also be utilized for quantitative analysis.
Do oranges have the most vitamin c?
Actually strawberries have the most Vitamin C out of all foods as far as I know!
What foods can you eat to get 1000mg of vitamin c?
oranges and grapefruit also red peppers have plenty of vitamin C
Which foods would prevent rickets and scurvy?
Foods high in vitamin C.
What foods have vitamin c?
PeppersCitrus fruitsGreen VegetablesPotatoesStrawberriesCauliflower
What foods give vitamin c?
oranges and lemons
