Ascorbic acid, also known as vitamin C, is a water-soluble vitamin that is easily oxidized. When exposed to air, ascorbic acid reacts with oxygen to form dehydroascorbic acid, which is inactive as a vitamin. This process is accelerated by heat, light, and metal ions such as copper and iron.

To prevent the oxidation of ascorbic acid, it should be stored in a cool, dark place, away from sources of heat and metal ions. It should also be stored in an airtight container to prevent exposure to oxygen.

If ascorbic acid solution is exposed to the air, it will gradually lose its potency. The rate of loss will depend on the conditions under which the solution is stored.

Therefore, it is important to take precautions to prevent the oxidation of ascorbic acid solution in order to maintain its potency.