What term describes a substance that releases hydroxide ions and is negatively charged?

The term that describes a substance that releases hydroxide ions and is negatively charged is "alkaline." Alkaline substances are characterized by their ability to accept protons (H+ ions) or release hydroxide ions (OH-) into a solution, thereby increasing the pH and making the solution basic.

In the context of esthetics and skincare, understanding the pH of products is crucial, as formulations with alkaline properties can influence skin health and treatment outcomes. For example, alkaline substances are often found in certain cleansers and exfoliants, which can help in balancing the skin's pH and providing a good cleansing effect.

Other terms in the question relate to different types of substances. Acids are substances that donate protons and are positively charged, neutral describes a balanced state with a pH of 7, and saline refers to a salt solution, typically not specifically addressing the release of hydroxide ions. Understanding these distinctions helps in selecting appropriate skincare products and treatments based on their chemical properties.