A standard solution of FeSCN2+ is prepared by combining 9.00 mL of 0.200 M Fe(NO3)3 w/1.00 mL of 0.0020 M KSCN. The equilibrium concentration of FeSCN2+ ([FeSCN2+]std) for this standard solution is assumed to be

Question

A standard solution of FeSCN2+ is prepared by combining 9.00 mL of 0.200 M Fe(NO3)3 w/1.00 mL of 0.0020 M KSCN. The equilibrium concentration of FeSCN2+ ([FeSCN2+]std) for this standard solution is assumed to be
M.

What permits this assumption?

A. The concentration of Fe(NO3)3is much higher than the concentration of SCN–.
B. The equilibrium reaction has a very high Kc.
C. The reaction quotient (Q) is greater than Kc.
D. The excess Fe3+ prevents the formation of the neutral Fe(SCN)3.
E. Under the conditions given above, LeChateliers principle dictates that the reaction shifts to the left.

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