kyselina

Kyselina is the Czech and Slovak term for acid. In chemistry, an acid is a substance that donates protons in Bronsted–Lowry theory or, in Arrhenius terms, increases the concentration of hydrogen ions in an aqueous solution. The broader Lewis definition describes acids as electron-pair acceptors. This concept covers both inorganic (mineral) acids and organic acids, which may contain carboxyl groups or other functional groups.

Acids are commonly classified as inorganic (mineral) or organic. Inorganic acids include hydrochloric acid (HCl), sulfuric acid (H2SO4), nitric acid (HNO3), and phosphoric acid (H3PO4). Organic acids include acetic acid (CH3COOH), citric acid (C6H8O7), formic acid (HCOOH), and oxalic acid (H2C2O4). Acids vary in strength: strong acids dissociate completely in water, while weak acids only partially dissociate. Their concentration also affects properties such as pH and reactivity.

Key properties and reactions of acids include their ability to react with metals to release hydrogen gas, react with carbonates to form carbon dioxide, and neutralize bases to form salts and water. In aqueous solutions, acids lower the pH, and their strength is described by dissociation constants (Ka) in the case of weak acids.

Applications of acids span many fields: mineral acids are essential in chemical synthesis, refining, and pH control; organic acids are important in food, pharmaceuticals, and buffers. Safety considerations are important, as acids are often corrosive and can cause injury upon contact. Proper storage, handling, and appropriate personal protective equipment are standard precautions.