What type of reaction does ascorbic acid undergo in the presence of indophenol?
Ascorbic acid (also known as vitamin C) reacts with oxidizing agents such as indophenol to form dehydroascorbic acid. This reaction can be used to determine how much vitamin C is present in a sample through titration.
Is ascorbic acid reactive?
pH dependence. Ascorbic acid reacts with several species of ROS, as well as the oxidized forms of several transition metals (Fig. 1). As ascorbic acid (AH2) can readily lose a proton to form the ascorbate anion (AH−), (pKa,1 = 4.1; pKa,2 = 11.8) both AH2 and AH− play roles in chemistry at low and neutral pHs.
Is ascorbic acid a reducing agent or oxidizing agent?
reducing agent
Ascorbic acid is a good reducing agent and facilitates many metabolic reactions and repair processes.
What type of reaction occurs when DCIP and ascorbic acid react?
redox reaction
This reaction is a redox reaction: vitamin C (ascorbic acid) is oxidized to dehydroascorbic acid, and DCPIP is reduced to the colorless compound DCPIPH2 DCPIP (blue) + H+ → DCPIPH (pink) DCPIPH (pink) + vitamin C → DCPIPH2 (colorless)In this titration, when all the ascorbic acid in the solution has been used up, there …
What is Indophenol method?
The indophenol method for determining ammonia in water samples is based on the formation of an indophenol blue pigment during the reaction of phenol and hypochlorite in the presence of ammonia. In alkaline medium (pH = 8–11.5) a chloramine is first produced.
Why is 𐐛 ascorbic acid referred to as an acid despite having no carboxylic acid group?
From a chemical standpoint, ascorbic acid is a sugar derivative, and not the carboxylic acid that its name might suggest. Its relatively high acidity is instead a consequence of a rather unusual ene–diol structure. Upon deprotonation of the hydroxy group at C3, it becomes a resonance-stabilized anion.
What is the structure of ascorbic acid?
Chemistry of ascorbic acid
| Names | |
|---|---|
| Chemical formula | C6H8O6 |
| Molar mass | 176.124 g·mol−1 |
| Appearance | White or light yellow solid |
| Density | 1.65 g/cm3 |
What is vitamin C structure?
Vitamin C has the chemical formula C6H8O6 and a molecular mass of 176.14 grams per mol. Vitamin C is purely the L-enantiomer of ascorbate; the opposite D-enantiomer has no physiological significance. Both forms are mirror images of the same molecular structure.
How is ascorbic acid oxidized?
Ascorbic acid is a well-known antioxidant and radical scavenger. It can be oxidized by losing two protons and two electrons, but normally loses only one electron at a time.
Why is vitamin C easily oxidized?
Overall we can say that: vitamin C has the ability to reduce other molecules (and thus be oxidized itself). This means that it can donate two electrons to another component. The slightly extended versions of the chemical reactions we just described involve several radicals.
What is indophenol used for?
Indophenol is used in hair dyes, lubricants, redox materials, liquid crystal displays, fuel cells and chemical-mechanical polishing. It is an environmental pollutant and is toxic to fish.
How do you make indophenol dye?
Dye solution: Dissolve 50 mg of the Sodium salt of 2, 6 dichlorophenol indophenol dye in 150 ml hot glass distilled water containing 42 mg of Sodium bicarbonate. Cool and dilute with distilled water to 200 ml. Store in refrigerator and standardize.
What are the side effects of ascorbic acid?
Doses of Ascorbic Acid up to 6000 mg /were administered/ to 29 infants, 93 children of preschool and school age, and 20 adults for more than 1400 days. Toxic effects at the higher doses were observed in five adults and four infants and included nausea, vomiting, diarrhea, flushing of the face, headache, fatigue, and disturbed sleep.
Does titrimetric determination of ascorbic acid with 2-6-dichlorophenol indophenol in commercial liquid diets work?
Titrimetric determination of ascorbic acid with 2,6-dichlorophenol indophenol in commercial liquid diets The titrimetric determination of ascorbic acid in the presence of a variety of potentially physically and chemically interfering species in commercial liquid diets is presented.
Research Triangle Park, North Carolina. Separated from strong oxidants and strong bases. Solutions of ascorbic acid are rapidly oxidized in air and in alkaline media; the drug should be protected from air and light.
What is the reaction between ascorbic acid and phenylenediamine?
Ascorbic acid is oxidized to dehydroascorbic acid in presence of Norit. Oxidized form is reacted with 0-phenylenediamine to produce fluorophor having activation max. at ca 350 nm and fluorescence max. at ca 430 nm. Fluorescence intensity is proportional to concentration. Association of Official Analytical Chemists.