Answered: The reaction: Fe3+(aq) + SCN- (aq) ⇌…

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 reaction: Fe3+(aq) + SCN-

(aq) ⇌ FeSCN2+(aq) is an equilibrium reaction that produces a colored product, at
equilibrium the reaction is an orange color. The complex ion FeSCN2+(aq) is a very dark reddish brown,
while the reactant Fe3+ is a very pale yellow and SCNis colorless.
Starting with a system at equilibrium, predict the change to the color when the following take place.
A) More Fe3+ is added

B) HPO4
2-
(aq)was added and precipitated the Fe3+(aq) ions as Fe2(HPO4)3(s).

Expert Solution

Step 1

According to the question,

The reaction is as follows,

$F e^{3 +} (a q) + S C N^{-} (a q) ⇋ F e S C N^{2 +} (a q)$

The color of the species is given as,

$F e^{3 +} (a q) \underset{}{\to} p a l e y e l l o w S C N^{-} (a q) \overset{}{\to} c o l o u r l e s s F e S C N^{2 +} (a q) \overset{}{\to} d a r k r e d d i s h b r o w n$

Find the color changes after adding the given species.

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