After separation of valuable metals from the leaching solution of ores or secondary resources, the recovery of inorganic acids from the raffinate is important. Therefore, the possibility of recovering inorganic acids, such as HCl, H2SO4 and HNO3, by extraction with Tris 2-ethylhexyl amine (TEHA) was investigated. The solvent extraction reaction of acid by TEHA was identified by applying a slope analysis method to the extraction data. The extraction efficiency of the acids by TEHA was in the order HNO3 > HCl > H2SO4, which corresponds well to the variation in the electric charge densities of the anions of each acid. The loading capacity of TEHA for HNO3, HCl and H2SO4 was determined and the extraction behavior of the acid seemed to be affected by the acid concentration in the organic phase. It was possible to strip all the HCl and H2SO4 by using distilled water at room temperature, while the stripping percentage of HNO3 at the same conditions was very low.