Citric acid is a weak organic acid that is found naturally in citrus fruits such as lemons and limes. It is a colorless, crystalline powder that is highly soluble in water and has a strong, sour taste.

Citric acid is widely used in the food and beverage industry as a flavor enhancer and preservative. It is also used as a pH adjuster and chelating agent. In food, it is used to add a sour taste to candies, soft drinks and other food items.

In the pharmaceutical industry, citric acid is used as an excipient in the production of tablets and capsules. It is also used in cosmetics and personal care products as an exfoliant and pH adjuster.

In the cleaning industry, citric acid is used as a descaling agent to remove mineral buildup from hard surfaces such as kitchen and bathroom fixtures.

In the agricultural industry, citric acid is used as a fungicide and herbicide to control the growth of mold and mildew.

In the field of drilling, citric acid is used as a corrosion inhibitor to help protect the drilling equipment and the wellbore. It is also used to stabilize clay and prevent it from swelling, which can cause problems such as poor fluid circulation and borehole instability.

Citric acid is generally considered to be safe for human consumption and for use in products.