What chemical reactions can manganese have?
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It slowly displaces hydrogen from water. It reacts readily with hydrochloric and sulfuric acids and with the halogens. In compounds, manganese assumes a number of different oxidation states. It is easily raised to the +2 state, for example, by reaction with hydrochloric acid to form manganous chloride, MnCl 2 . Manganese is also found in the +3 (manganic) state, but this state is unstable and usually reverts to the +2 state. Both manganous and manganic ions form acidic solutions. Manganese is found in the +4 state largely in manganese dioxide, MnO 2 ; the +4 oxidation state is amphoteric, i.e., in the +4 state manganese can either donate or accept electrons in chemical reactions. Manganese also exists in +6 and +7 states; the +6 state is found in the manganate ion (MnO 4-- ) and the +7 state in the permanganate ion (MnO 4- ). These ions are stable in basic solutions. There is also evidence for a +1 state (in a complex cyanide) and for an unstable +5 state (in basic solutions).
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