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Why does CdS dissolve in HCL, when CuS and Bi2S3 will not?
8 years ago

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DrBob222
Who says Bi2S3 and CuS will not dissolve? In most circumstances they will
8 years ago
Doc
Sulfur combines with H+ => H2S(g) and shifts the solubility equilibrium toward more ionization and increased solubility.

The formation of H2S essentially is removing S-2 from the solution forcing the metal-sulfide to decompose in order to replace the sulfur combined with the added H+.
8 years ago

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