Home > categories > Minerals & Metallurgy > Copper Sheets > When doing copper reliefs, there is a step of using sodium sulfide to scrub the surface of copper plate. The copper plate will turn black. Is the black substance copper sulfide?

Question:

When doing copper reliefs, there is a step of using sodium sulfide to scrub the surface of copper plate. The copper plate will turn black. Is the black substance copper sulfide?

Answer:

Because the solubility product of CuS is very small, the reaction shifts to the rightH+ in H2S can also oxidize Ag, no wonder

Copper sulfideOxygen in the air; oxidizing

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When doing copper reliefs, there is a step of using sodium sulfide to scrub the surface of copper plate. The copper plate will turn black. Is the black substance copper sulfide?

Answer:

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