Answer:
Co²⁺ ions
Explanation:
The ion responsible for the color change in the cobalt solution is Co²⁺ ions. This is because the chemical formula of the given compound is:
CoCl₂;
of the two elements that combined to form this specie, Co is a transition element.
- Transition elements are known to occupy the d-block on the periodic table.
- Most elements here are usually characterized by their variable oxidation states.
- They also produce a wide range of colors.
