What are alkalis also known as?

Alkalis are also known as bases. In chemistry, the term "alkali" typically refers to specific types of bases that are soluble in water and yield hydroxide ions (OH-) when dissolved. They are characterized by their ability to neutralize acids, a fundamental reaction in acid-base chemistry. Common examples of alkalis include sodium hydroxide and potassium hydroxide.

In the context of the question, recognizing alkalis as bases is crucial because this classification helps understand their properties and reactions in various chemical contexts, particularly in esthetics, where pH balance is essential for skin care formulations. Understanding the role of alkalis as bases also informs their use in specific skin treatments, such as exfoliation or chemical peels, where pH manipulation is necessary.

The other terms mentioned—acids, salts, and esters—represent different chemical categories with distinct properties and functions, but they do not directly interchange with alkalis, which reinforces the importance of the correct answer in identifying the chemistry involved in esthetics.