CONC

Conc is an abbreviation commonly used in chemistry and related fields to denote concentration or the concentrated form of a substance. It appears on chemical labels, catalog entries, and safety data sheets to indicate that a solution is not diluted. When placed before a chemical name, as in conc. HCl or conc. sulfuric acid, it signals that the solution has a high solute proportion and typically a high molarity. The exact level of concentration is not specified by the abbreviation alone; additional data, such as molarity, weight percentage, or density, is required to determine the precise composition. Because concentration can vary by substance and jurisdiction, the term must be clarified in context.

Beyond chemistry, conc occasionally appears in other fields to indicate concentration in a general sense, or, in computing, as an informal shorthand for concatenation. However, the chemical usage is the most common.

Safety and handling: Concentrated chemicals are generally more hazardous than diluted forms. Handling guidelines— including appropriate personal protective equipment, ventilation, and safe storage— should be followed, and the safety data sheet consulted for specific risks.

See also: concentration, dilution, chemical safety labeling, material safety data sheet.