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# A solution contains 1.01×10-2 M potassium hydroxide and 6.56×10-3 M sodium sulfide. Solid copper(II) nitrate is...

A solution contains 1.01×10-2 M potassium hydroxide and 6.56×10-3 M sodium sulfide.
Solid copper(II) nitrate is added slowly to this mixture.

A. What is the formula of the substance that precipitates first?

Formula=

B. What is the concentration of copper(II) ion when this precipitation first begins?
[Cu2+] = ___M

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