What is the [Cl-] in a 0.40M solution of iron III chloride?

[Cl⁻] = 1.2 M

Explanation:

Equation of the disssociation of Iron (II) chloride is given below:

FeCl₃ > Fe³⁺ + 2Cl⁻

from the dissociation equation, 3 moles of Cl ions are produced from the dissociation of FeCl₃.

In a 0.40 M solution of FeCl₃, the concentration of Cl⁻ ions will be 0.40 * 3 = 1.20 M

Therefore, the concentration of Cl⁻ ions, [Cl⁻] = 1.2M