Na2MnO4, commonly referred to as Sodium Manganate (IV), is a black or dark brown solid. Its English name is Sodium Manganate. Its molar mass is 172.02 g/mol. Na2MnO4 has a molecular structure with two sodium atoms (Na), one manganese atom (Mn) and four oxygen atoms (O). It forms sodium ions (Na+) and manganate ions (MnO4-2).
In terms of physical properties, Na2MnO4 typically exists as a black or dark brown solid. It has no distinctive smell and the pH of the Na2MnO4 solution ranges from 7 to 14, suggesting that it is basic. Chemically, Na2MnO4 can react with other substances to form different compounds such as K2MnO4, BaMnO4, and many other compounds.
Na2MnO4 is typically used in redox reactions and can also be used to prepare MnO2.
Regarding the preparation of Na2MnO4, in the laboratory, Na2MnO4 is usually prepared by reacting NaOH with MnO2 powder under heating, and then reacting with O2. Industrially, Na2MnO4 is produced from the melting process of a mixture of MnO2, NaNO3 and NaOH powder.