Abstract
The solubility product of CuS in a 3% agar gel has been determined by a technique involving the formation of Liesegang bands. Aqueous solutions of copper (II) and sulfide ions are allowed to diffuse towards one another from opposite ends of a length of gel. The rate of growth of the first (and only) band is followed chemically, and the time corresponding to zero moles of CuS after beginning of diffusion is determined by a simple extrapolation. This value, along with the band position, is substituted into an appropriate solution of Fick's Second Law for each diffusion species, and the concentration product is formed. The value is within the range of values for the K sp, of CuS in water as reported in the literature. Assumptions are discuseed, as are limitations and generality of the method.
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