sic.cengagenow.com Chapter 15-Equilibria of Other ching and learning resourc...

Question

sic.cengagenow.com Chapter 15-Equilibria of Other ching and learning resourc... Chegg Study Order Confirmation Chegg.com Use the References to access important values if needed for this ques A solution contains 7.78x 10d M potassium carbonate and 6.56x10d M ammonium 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? Cu] Submit Answer Retry Entire Group 4 more group attempts remaining

Explanation / Answer

From the given data

(a) CuS with low Ksp (1 x 10^-36) than CuCO3 (1.4 x 10^-10) would precipitate first

CuS

(b) [Cu2+] concentration when CuS begins precipitate = Ksp/[S^2-]

                                                                                       = 1 x 10^-36/6.56 x 10^-3

                                                                                       = 1.52 x 10^-34 M

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