Abstract
Tin sulfide was precipitated frorn solutions containing 100 mg cobalt and 100 mg tin and the acidity of the solutions was varied from pH 1.0 to 4.5, A possible explanation of the experimental results was offered. With the large amount of cobalt present it was found that the surface of the precipitated sulfide was saturated by adsorbed cobalt and that the amount adsorbed did not vary within the pH range studied. The pH at which the cobalt sulfide first precipitated was lower in the presence of tin sulfide than in the blank where no particles were present. The amount of cobalt adsorbed by the tin sulfide agreed well with the values obtained by Flagg 3 under similar conditions and with the values obtained by FEIGL2.
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