K_c Is 1

question 78

Multiple Choice

K_c is 1.67 × 10²⁰ at 25°C for the formation of iron(III) oxalate complex ion: Fe³⁺(aq) + 3 C₂O₄^2-(aq) ⇌ [Fe(C₂O₄) ₃]^3-(aq) .
If 0.0800 M Fe³⁺ is initially mixed with 1.00 M oxalate ion,what is the concentration of Fe³⁺ ion at equilibrium?

• A) 1.09 × 10^-21 M
• B) 0.0100 M
• C) 2.09 × 10¹⁹ M
• D) 1.97 × 10²¹ M