Question

Identify the correct formula for hexaaquamanganese(II) ion.

• A. $\left[Mn\right(H_{2}O{)}_6{]}^{2+}$
• B. $\left[Mn\right(H_{2}O{)}_6{]}^{2-}$
• C. $\left[M{n}_2\right(H_{2}O{)}_6{]}^{+}$
• D. $\left[Mn\right(H_{2}O{)}_6]$

Answer 1

The correct option is A $\left[Mn\right(H_{2}O{)}_6{]}^{2+}$

The parenthesis after manganese in IUPAC name represents its oxidation state (+2).
Thus, the central metal atom is manganese and its oxidation state is +2.
Aqua - $H_{2}O$ ligand and it is a neutral ligand.
'Hexaaqua' represents six $H_{2}O$ ligands.

Thus, the charge of the coordination entity will be same as the oxidation state of metal.
Hence, the formula of the complex ion is $\left[Mn\right(H_{2}O{)}_6{]}^{2+}$