Molecule Investigation Introduction Thomas Pilot Vitamin C (ascorbic acid) is an essential component of human nutrition, as it is an antioxidant that the body requires. Having a deficiency in Vitamin C can lead to scurvy, a disease characterized by abnormalities in human bones and teeth. Fruits and vegetables are common sources of Vitamin C, notably oranges and citrus fruits.
Cooking and the application of heat destroy the vitamin so such fruits must be raw in order to obtain the benefits from these sources.The investigation that is to be undertaken is to find the Vitamin C content from four different common sources; a Vitamin C tablet, two different common household orange Juices, and a 99. 9% pure lemon Juice. In the conduction of this experiment, the use of redo iterations was essential. Acid-base iterations can also be used however they are not able to complete all of the reactions in the solution and do not interfere with the oxidation of ascorbic acid by iodine solution.
Iodine is relatively insoluble, but this can be improved by completing the iodine with iodide to form trioxide as the following formula suggests: l_(2(as))+ (IA-) _(3(as)) This trioxide ion can be used to oxidize vitamin C to form dehydration's acid. In this reaction the trioxide ion is reduced to iodide ion, and ascorbic acid, CHICHI is oxidized to dehydration's acid, CHICHI. Aim The aim of this investigation is to discover the exact content of Vitamin C in a number of different common household products. Materials 1 x O.
AL Burette 1 x Retort Stand 1 x Burette Clamp 1 x O. ALL Pipette 1 x 0. AL Volumetric Flask 1 x Vitamin C tablet (0. Egg) 0.
ALL 'Just Juice' Orange Juice 0. ALL Browner 'Orange C' Fruit Drink O. ALL Coles 99. 9% Lemon juice Extensive Supply of Distilled Water Extensive Supply of Tap Water 1-3 x 0.
ALL conical Flask 1 x 0. AL Beaker 1 x Funnel 1 x Mortar and Pestle 1 x Pipette Filler Extensive Amount of Detergent Pen and Paper/Laptop Method Preparing the Iodine Solution Dissolve Jug potassium IEEE (SKI) Ana 0. 2/g potassium I distilled water. Add ml of 3 moll-1 sulfuric acid.Pour this solution into a mall graduated cylinder and dilute it to a final volume of mall with distilled water.
Mix solution thoroughly and carefully. Transfer the solution to a mall storage bottle. Label the bottle as your iodine solution. This will be needed throughout the entire experiment.
Standardizing the Iodine solution Add 25 ml of Vitamin C standard solution to a 250 ml conical flask. Add 10 drops of 1% starch solution. Rinse through the burette with a small volume of the iodine solution and then proceed to fill it with this solution.
