de aqueous solutions of t e as the solids (see ima

Chemistry by OpenStax (2015-05-04)
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Author:Klaus Theopold, Richard H Langley, Paul Flowers, William R. Robinson, Mark Blaser
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Chapter15: Equilibria Of Other Reaction Classes
Section: Chapter Questions
Problem 10E: The Handbook of Chemistry and Physics (http://openstaxcollege.org/l/16Handbook) gives solubilities...
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A student was given two vials and each contained a chromium salt. The vial labeled
CrCl,-6 H,0 contained a dark green solid and the one labeled Cr(NO,)3-9 H,0 contained
a purple solid. She made aqueous solutions of these solids and the colors of these
solutions were the same as the solids (see image below).
Initial appearance of aqueous solutions (0.05 M)
of Cr(NO3); 9 H,0O (left) and CrCl; 6 H,O (right)
After preparing these solutions, she had to leave the lab and the solutions remained
sitting on the bench for 24 hours. When she returned the next day, she found that the
aqueous solution of CrCl, had changed color and was now purple like the solution
containing Cr(NO3);'9 H,0 (see image below).
Appearance of the same aqueous solutions (0.05
M) of Cr(NO3); 9 H,O (left) and CrCl;'6 H,O
(right) after 24 hours
Based upon this observation, please describe what happened in the solution. Write out
reactions that describe the changes that took place in the CrCl3-6 H,O solution over the
course of 24 hours.
Transcribed Image Text:A student was given two vials and each contained a chromium salt. The vial labeled CrCl,-6 H,0 contained a dark green solid and the one labeled Cr(NO,)3-9 H,0 contained a purple solid. She made aqueous solutions of these solids and the colors of these solutions were the same as the solids (see image below). Initial appearance of aqueous solutions (0.05 M) of Cr(NO3); 9 H,0O (left) and CrCl; 6 H,O (right) After preparing these solutions, she had to leave the lab and the solutions remained sitting on the bench for 24 hours. When she returned the next day, she found that the aqueous solution of CrCl, had changed color and was now purple like the solution containing Cr(NO3);'9 H,0 (see image below). Appearance of the same aqueous solutions (0.05 M) of Cr(NO3); 9 H,O (left) and CrCl;'6 H,O (right) after 24 hours Based upon this observation, please describe what happened in the solution. Write out reactions that describe the changes that took place in the CrCl3-6 H,O solution over the course of 24 hours.
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