What is the free iron(III) concentration in a solution that was initially 0.10 M Fe3+ and...

What is the free iron(III) concentration in a solution that was initially 0.10 M Fe³⁺ and 1.0M SCN^-? [Fe(SCN)₂]⁺, K_f 2.310³

Expert Solution

Fe^3+ (aq) + 2SCN^- (aq) ----------------------> [Fe(SCN)2}^+ (aq)

I 0.1 1 0

C -0.1 2*-0.1 0.1

E 0 0.8 0.1

x 0.8 0.1

Kf = [Fe(SCN)2}^+/[Fe^3+][SCN^-]^2

2.3*10^3 = 0.1/x*(0.1)^2

x = 0.1/2.3*10^3*(0.1)^2 = 0.00435

[Fe^3+] = x = 0.00435M

queen_honey_blossom answered 2 years ago

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