Potassium acid Phthalate with EDTA (KAPE) crystals were allowed to grow for about three to four weeks at room temperature without disturbing the vessels containing solutions and were harvested. Optical absorption studies revealed that the doped crystals possess very low absorption in the entire visible region. The presence of functional groups in the crystal lattice has been determined qualitatively by FTIR analysis. The thermal stability was evaluated by TG-DSC analysis. The dielectric constant has been studied as a function of frequency for the doped crystals. Grown crystals were characterized by single crystal XRD and confirmed that the crystal belongs to orthorhombic system.