Use the mean value that you determined for keq to calculate the SCN- concentration in a...

Use the mean value that you determined for keq to calculate the SCN- concentration in a whose initial Fe3+ concentration was 4x10^-2 M and initial SCN- concentration was 1x10^-3 M. Is all of the SCN- in the form of FeNCS2+ My Keq was 451.51

Expert Solution

Fe^3+ (aq) + SCN^- (aq) ------------> FeNCS^2+(aq)

I 0.04 0.001 0

C -x -x +x

E 0.04-x 0.001-x +x

Kc = [FeNCS^2+]/[Fe^3+][SCN^-]

451.51 = x/(0.04-x)(0.001-x)

451.51*(0.04-x)(0.001-x) = x

x = 0.000946

[Fe^3+] = 0.04-x = 0.04-0.000946 = 0.039054M

[SCN-] = 0.001-x = 0.001-0.000946 = 5.4*10^-5M

[FeNCS^2+] = x = 0.000946M

queen_honey_blossom answered 2 years ago

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