Answered: (a) Adding KSCN (b) Adding Ag* Photas D…

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Question

The photographs below (a) show what occurs when a solution of iron(III) nitrate is
treated with a few drops of aqueous potassium thiocyanate. The nearly colorless
iron(III) ion is converted to a red [Fe(H2O)5SCN)
2+
ion. (This is a classic test for the
presence of iron(III) ions in solution.)
[Fe(H2O)6
]
3+
(aq) + SCN
−
(aq) ⇄ [Fe(H2O)5SCN]
2+
(aq) + H2O(ℓ)
(a) As more KSCN is added to the solution, the color becomes even more red.
Explain this observation.
(b) Silver ions form a white precipitate with SCN
−
ions. What would you observe
on adding a few drops of aqueous silver nitrate to a red solution of [Fe(H2O)5 Explain your observations?

(a) Adding KSCN
(b) Adding Ag*
Photas D Cangage Laaming/Carles O. Wners

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