Abstract

Fathia M. Helmy

The molecular weights of anhydrous Co(ll) chloride in anhydrous formic acid at different concentrations are determined. The maximum molecular weight obtained at very low concentrations is constant and found to be equal the molecular weight of two associated Co(ll) chloride molecules, Co2CI4. At concentrations higher than 25 x 10-4 mol/L, tetrahedral complexes are detected, white at lower of this concentration the octahedral complexes are found. A mechanism of tetrahedral change to a octahedral complex is suggested. The electrical conductivity was measured at 30°C. It was proved that, a tetrahedral complex is still present in small amount comparing to octahedral complexes at very dilute solutions. The solution of Co(ll) chloride in the formic acid behaves as a weak electrolyte from the conductivity measurements. The limiting molar conductivity is determined by applying the methods of the author et.al..Shedlovsky equation2 and S(z) function method of Shedlovsky and Kay3.

Co(ll) chloride; conductivity; Shedlovsky; S(z) function

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