consider the reaction a solution is made containing an initial 14028432& enVellu

Question

consider the reaction a solution is made containing an initial 14028432& enVellumHMAC de930d8761bab Secure | https://se masteringchemistry.co nmen Item 8 Part A Calculate the value of the equilibrium constant (Ke) Express your answer using two significant figures Consider the reaction Fet (aq)+SCN (aq) FeSCN2+ (aq) of A solution is made containing an initial [Fe 24x104 mol L- and an initial [SCN of 8.3x10-4 mol L- At equilibrium, FeSCN2+ 1 6x 10-4 mol L-1 Submit Incorrect; One attempt remaining; Try Again pr

Explanation / Answer

Solution:- We would make the ice chart and solve this as...

Fe3+(aq) + SCN-(aq) <------> FeSCN2+(aq)

I 2.4 x 10-4 8.3 x 10-4 0

C -X -X +X

E ( 2.4 x 10-4 - X) (8.3 x 10-4 - X) X

From the given info, [FeSCN2+] = 1.6 x 10-4

It means, X = 1.6 x 10-4

So, the equilibrium concentration of [Fe2+] = 2.4 x 10-4 - 1.6 x 10-4 = 8.0 x 10-5

[SCN-] = 8.3 x 10-4 - 1.6 x 10-4 = 6.7 x 10-4

Kc = [FeSCN2+]/[Fe3+][SCN-]

Kc =(1.6 x 10-4)/(8.0 x 10-5 x 6.7 x 10-4)

Kc = 3.0 x 103

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