Define the term acid?

An acid is a chemical substance that donates protons or hydrogen ions in a chemical reaction. Acids have a pH level lower than 7 and can react with bases to form salts. They are typically sour-tasting and can be corrosive in high concentrations.

An acid is a substance that donates a hydrogen ion (H+) when dissolved in water. It is characterized by a sour taste, the ability to react with metals to produce hydrogen gas, and the ability to turn litmus paper red. Acids are typically classified as either strong or weak. Strong acids completely dissociate in water to release all of their hydrogen ions, while weak acids only partially dissociate. Examples of strong acids include hydrochloric acid (HCl), sulfuric acid (H2SO4), and nitric acid (HNO3). Examples of weak acids include acetic acid (CH3COOH), carbonic acid (H2CO3), and phosphoric acid (H3PO4). Acids play an important role in many chemical processes, such as digestion, respiration, and the production of fertilizers and plastics.