Used as a source of fluoride ions in organic synthesis, particularly in nucleophilic fluorination reactions where it facilitates the replacement of leaving groups with fluorine atoms. Commonly applied in the preparation of fluorinated pharmaceuticals and agrochemicals due to its ability to promote SN2 reactions under polar aprotic conditions. Also employed in glass etching and metal surface treatment to remove oxides and improve adhesion. In analytical chemistry, utilized in buffer solutions for pH adjustment and in fluoride ion-selective electrode calibration. Its aqueous form enhances solubility and reactivity compared to solid anhydrous potassium fluoride, making it suitable for homogeneous reaction systems.