State four circumstances under which the oxidation of vitamin C may occur.(4 marks)June/July 2020

Vitamin C, also known as ascorbic acid, is an essential nutrient that is important for a variety of functions in the body. The oxidation of vitamin C may occur under certain circumstances, including:

1. Exposure to air: Vitamin C is susceptible to oxidation when it is exposed to air, as the oxygen in the air can react with the molecule and cause it to break down.
2. Heat: Vitamin C is also sensitive to heat, and may be destroyed or degraded when exposed to high temperatures.
3. Light: Vitamin C is sensitive to light, and may be damaged or destroyed when exposed to sunlight or other forms of light.
4. Metal ions: Vitamin C may react with certain metal ions, such as copper or iron, which can lead to the oxidation of the molecule.
5. pH: The pH of a solution can also affect the stability of vitamin C, as low pH levels (high acidity) may cause the molecule to break down.