a. b. c. Looking at both the Ksp and Kf data given in Section 4.2, what reaction

Question

a. b. c. Looking at both the Ksp and Kf data given in Section 4.2, what reactions List all species present in a 1.0 M ammonia solution. Is the pH of the ammonia solution acidic or basic? might occur when a 1.0 M ammonia is added to a Cu2+ solution? d. If a solid precipitate is formed when 1.0 M ammonia is added to Cu+, what itate is formed when 1.0 M ammonia is added to Cu2+, what has happened? What is the most likely product? Further addition of 1.0 M ammonia to the solution and precipitate from part d. does not dissolve the precipitate but addition of 15.0 M ammonia does. Explain. e. Lab 9 (Metal Cations)- Page 13 of 20

Explanation / Answer

Ammonia solution is basically NH4OH. Ions that are present in this solution : NH4^+, OH-, H^+.

(b) Ammonia solution will be basic

(c) Cu(OH)2 precipitate will form. precipitation of Cu(OH)2 is favored over complexation with NH3 and Ksp value is much smaller compared to Kf value. Cu^2+ + 2OH- -----> [Cu(OH)2]^2+

(d) If excexx ammonia is added, it will form a soluble complex. The reaction : [Cu(OH)]^2+ + 4NH4OH -----> [Cu(NH3)4]^2+ + 2H2O

Now in this reaction if concentration of Nh4Oh is very large , then the reaction will move in the forward direction

(e)

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