Chemistry
Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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A student performs an experiment to determine the equilibrium constant for the formation of  Fe(SCN)2+ (aq) using iron (III) nitrate and potassium thiocyanate.
 
Fe3+(aq) + SCN(aq) ⇌ Fe(SCN)2+(aq)
 
The equilibrium concentration for each species is provided in the table below.
 
Equilibrium concentrations:
 
[Fe3+]eq
[SCN]eq
[Fe(SCN)2+]eq
3.85 × 10−3 M 8.26 x 10−5 M 5.25 
× 10−5 M
 
(a) Based on the experimental data, determine the equilibrium constant, Kc.
  Kc = 
 

 
(b) If the actual Kc for this equilibrium reaction is 140, what is the percent error?
 
Percent error =  %
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