Determine the oxidation state of the metal ion in [co (nh3) 5br]2+. express your answer as an integer.

[Co (NH₃) ₅Br]²⁺

Ligands and charges on them,

5 * NH₃ = 5 * 0 = 0

1 * Br⁻¹ = 1 * - 1 = - 1

Charge on sphere = + 2

So, putting values in equation,

Co + (0) ₅ - 1 = + 2

Co + 0 - 1 = + 2

Co - 1 = + 2

Co = + 2 + 1

Co = + 3

Result:

Oxidation state of Co in [Co (NH₃) ₅Br]²⁺ is + 3.