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Cr*(aq) E° = = -0.41 V Cr*(ag) + e Crt(ag) + Зe Cr²*(aq) + 2e¯ Е %3D — 0.74 V Eо 3D — 0.91 V Cr(s) Cr(s)

Cr*(aq) E° = = -0.41 V Cr*(ag) + e Crt(ag) + Зe Cr²*(aq) + 2e¯ Е %3D — 0.74 V Eо 3D — 0.91 V Cr(s) Cr(s)

World of Chemistry, 3rd edition
World of Chemistry, 3rd edition
3rd Edition
ISBN:9781133109655
Author:Steven S. Zumdahl, Susan L. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan L. Zumdahl, Donald J. DeCoste
Chapter2: Matter
Section: Chapter Questions
Problem 29A
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Use the following data to determine if Cr²⁺(aq) can be pre-pared by the reaction of Cr(s) with Cr³⁺(aq):

Cr*(aq) E° = = -0.41 V Cr*(ag) + e Crt(ag) + Зe Cr²*(aq) + 2e¯ Е %3D — 0.74 V Eо 3D — 0.91 V Cr(s) Cr(s)
Transcribed Image Text:Cr*(aq) E° = = -0.41 V Cr*(ag) + e Crt(ag) + Зe Cr²*(aq) + 2e¯ Е %3D — 0.74 V Eо 3D — 0.91 V Cr(s) Cr(s)
Expert Solution
Step 1

The preparation of Cr?- (aq) from Cr(s) and Cr3+ (aq) can be done as given below;

(1) Cr3+ (aq) + e-  ----> Cr2+ (aq)                    E° = -0.41 V

Multiply equation (1) by (2);

(2) 2Cr3+ (aq) + 2e- ----> 2Cr2+ (aq)               E° = -0.41 V

Now;

(3) Cr2+ (aq)+ 2e- ----> Cr (s)                           E° = -0.91 V

(4) Cr(s) ----> Cr2+ (aq) + 2e-                           E° = -0.91 V

 

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