consider the following separation scheme; Soultion containing Ag+,Pb^2+, and Cu^

Question

consider the following separation scheme;

Soultion containing Ag+,Pb^2+, and Cu^2+

then add HNO3, so pH=1 and add H2s;Heat

x=?     and Y (aq), Pb^2+

what is present in the precipitate at X and which cation will precipitate next if you continue adding H2S to the above solution?

consider the following separation scheme;

Soultion containing Ag+,Pb^2+, and Cu^2+

then add HNO3, so pH=1 and add H2s;Heat

x=?     and Y (aq), Pb^2+

what is present in the precipitate at X and which cation will precipitate next if you continue adding H2S to the above solution?

Explanation / Answer

The precipitation will happen based on the Ksp of the various metal sulphides.

Cu(II) sulfide has a Ksp of 8×10-37

Silver(I) sulfide has a Ksp of 8×10-51

So Silver(I) sulfide will precipitate first and after its precipitation Cu(II)S will precipitate.

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