The charge of manganese (III) is 3+. The charge of a hydroxide ion is 1-. Hence the formula for manganese (III) hydroxide is Mn(OH)₃, as the sum of charges is zero. read more
Manganese(III) oxide is a chemical compound with the formula Mn 2 O 3. Preparation and chemistry. Heating MnO 2 in air at below 800 °C produces α-Mn 2 O 3 (higher temperatures produce Mn 3 O 4). γ-Mn 2 O 3 can be produced by oxidation followed by dehydration of manganese(II) hydroxide. read more