Effect of metallic salts added to the ${alpha}-Fe_2O_3-HCl;or;{alpha}-Fe_2O_3-H_2SO_4$ reaction systems were investigated by colorimetric and gravimetric determinations. While reductive salts exhibited remarkably enhanced reaction rate, non-reductive salts showed inhibitive results. We supposed that the improvement of dissolution rate of ${alpha}-Fe_2O_3$ by the addition of $FeCl_2$, a reductive salt, to the ${alpha}-Fe_2O_3-HCl$ system can be attributed to the formation of chloro-bridge between $Fe^{3+};and; Fe^{2+}$, and therefore some partial electronic charge transfer from $Fe^{2+};to;Fe^{3+}$ on the surface of ${alpha}-Fe_2O_3$ will be easily achieved through the bridged bond. The transferred charge to the surface will reduce the positive charge of initial $Fe^{3+}$, and also result to reduce the lattice energy of that site. Assuming tothat there is a linear relationship between the lattice energy change and the change of activation energy of the reaction system, the transferred partial electronic charge to $Fe^{3+}$ of ${alpha}-Fe_2O_3$ surface was calculated to be ca. 0.36e.