Diethanolamine [C4H11NO2 or (CH2CH2OH)2NH]

Amphoteric refers to a substance or compound that has the ability to react as both an acid and a base. In other words, it can either accept a proton (H+) to act as a base or donate a proton to act as an acid, depending on the conditions of the reaction. The term "amphoteric" is often used in the context of chemistry to describe species that exhibit this dual nature of reactivity.

Sodium Lauryl Ether Sulfate (SLES) is an anionic surfactant commonly used in various personal care and cleaning products. It is derived from lauryl alcohol and ethylene oxide, followed by sulfation to produce the final compound. SLES is known for its excellent foaming and cleaning properties, making it a popular ingredient in shampoos, body washes, toothpaste, and household cleaners. As a surfactant, SLES acts as a detergent and emulsifier, helping to remove dirt, oil, and grease from surfaces. It lowers the surface tension of liquids, allowing them to spread and penetrate more effectively. Additionally, SLES can create a rich and stable foam, enhancing the cleansing experience. It's worth noting that SLES can be derived from natural or synthetic sources, and its production may involve the use of petroleum-based ingredients. However, formulations can vary among manufacturers, so it's important to check product labels or consult the manufacturer directly for specific information on the origin and processing of SLES.