Tri-fluororacetic acid (TFAA), also called trifluoroacetic acid, is an organic compound with the formula CF3CO2H. It is a colorless liquid that is used as a reagent in organic chemistry and biochemistry. It is a versatile reagent and is used in the synthesis of many organic compounds. It is a strong acid, with a pKa value of 0.2. It is a powerful fluorinating agent and can be used to introduce fluorine atoms into organic molecules. TFAA is also a useful solvent and is miscible with water and many organic solvents.