Question

Equilibrium constant in aquenous solution

If all SCN- were not converted completely to FeNCS2+ when the calibration curve was prepared would this raise or lower the value of Keq? Explain.

Answer 1

Equilibrium constant in aquenous solution

If all SCN- were not converted completely to FeNCS2+ when the calibration curve was prepared would this raise or lower the value of Keq? Explain.

The Keq for the gfollowing recation is as follows:

Fe^3+ + SCN^- ==> FeSCN^2+

Keq = [FeSCN^2+]/[Fe^3+][SCN^-]

If all SCN- were not converted completely to FeNCS2+ means the concentration of SCN^- will be too high and FeSCN^2+ will be too low.

Therefore the value of [FeSCN^2+]/[Fe^3+][SCN^-] will be low and thus the Keq will be too low.