Charges of Complex Ions of Some Transition Metals in Aqueous Solution of Hydrochloric Acid

Abstract

The charges for chloro-complex ions of some transition metals were estimated from electrophoretic measurements on solution of hydrochloric acid in the concentration range 1 N to 10 N and the temperature range 3°C to 82°C.
With increasing hydrochloric acid concentration, the average charges of the Co (II), Cu (II), Fe (III), and Ni (II) complex ions decrease gradually from +2 to −2, +2 to −2, +1 to −1, and +2 to +0.5, respectively. The charges of the Co (II), Cu (II), and Fe (III) complex ions decrease with increasing temperature and change sign from positive to negative for the intermediate hydrochloric acid concentration. The charge of the Ni (II) complex ion decreases also with increasing temperature but does not change sign.