Widely used as an acid catalyst in organic synthesis, especially in esterification, etherification, and dehydration reactions. Its strong acidity and good solubility in organic solvents make it ideal for promoting reactions in non-aqueous environments. Commonly employed in the production of dyes, pharmaceuticals, and fragrances. Also used in polymer chemistry as a curing agent or cross-linking promoter in resins and coatings. Frequently chosen over mineral acids due to its ease of handling, lower corrosivity, and ability to form well-defined crystalline salts useful in purification processes.