Advance Study Assignment: Relative Stabilities of Complexlons and Precipitates Prepared fromSolutions of Copper(II)1. In testing the relative stabilities of Cu(II) species using a well plate, a student adds 6 drops 1 M NH3to 6 drops 0.1 M Cu(NO3)2. He observes that a blue precipitate initially forms (after the first few dropsof 1 M NH3), but that in excess NH3 (5 or 6 drops) the precipitate dissolves and the solution turnsdeep blue. Addition of 6 drops 1 M NaOH to the deep blue solution results in the formation of a blueprecipitate.a.What is the formula of the Cu(II) species in the deep blue solution obtained with excess NH;?b. What is the formula of the blue precipitate present after addition of 1 M NAOH?c. Which species is more stable in equal concentrations of NH3 and OH¯, the one in Part A or the onein Part B?

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What is the formula of the Cu(II) species in the deep blue solution obtained with excess NH3! a. b. What is the formula of the blue precipitate present after addition of 1 M NaOH?

Chemical Principles in the Laboratory

11th Edition

ISBN:9781305264434

Author:Emil Slowinski, Wayne C. Wolsey, Robert Rossi

Publisher:Emil Slowinski, Wayne C. Wolsey, Robert Rossi

Chapter27: Relative Stabilities Of Complex Ions And Precipitates Prepared From Solutions Of Copper(ii)

Section: Chapter Questions

Problem 1ASA

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Question

Advance Study Assignment: Relative Stabilities of Complex
lons and Precipitates Prepared from
Solutions of Copper(II)
1. In testing the relative stabilities of Cu(II) species using a well plate, a student adds 6 drops 1 M NH3
to 6 drops 0.1 M Cu(NO3)2. He observes that a blue precipitate initially forms (after the first few drops
of 1 M NH3), but that in excess NH3 (5 or 6 drops) the precipitate dissolves and the solution turns
deep blue. Addition of 6 drops 1 M NaOH to the deep blue solution results in the formation of a blue
precipitate.
a.
What is the formula of the Cu(II) species in the deep blue solution obtained with excess NH;?
b. What is the formula of the blue precipitate present after addition of 1 M NAOH?
c. Which species is more stable in equal concentrations of NH3 and OH¯, the one in Part A or the one
in Part B?

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