Question

In which direction will the point of equilibrium shift when the concentration of iron (lll) ion decreases in the following equilibrium? Fe +3 (aq) + SCN -1 (aq) —-> Fe (SCN) +2 (aq) a. Shift to the right b. Shift to the left c. No shift

Answer 1

b. Shift to the left

Step-by-step explanation

If the concentration of a substance is changed, the equilibrium will shift to minimize the effect of that change. If the concentration of a reactant is increased the equilibrium will shift in the direction of the reaction that uses the reactants, so that the reactant concentration decreases.

Fe⁺³ (aq) + SCN⁻¹ (aq) —-> Fe (SCN)⁺² (aq)

When the concentration of iron (lll) ion decreases in the above equilibrium the direction in which the point of equilibrium will shift is from right to left.

Hence, the correct option is:

b. Shift to the left