Manganese sulfate

Manganese(II) sulfate

Manganese(II) sulfate monohydrate
Manganese(II) sulfate tetrahydrate
Names
IUPAC name Manganese(II) sulfate
Identifiers
CAS Number	7785-87-7 Y 10034-96-5 (monohydrate) N 10101-68-5 (tetrahydrate) N
3D model (Jmol)	Interactive image
ChemSpider	22984 Y
ECHA InfoCard	100.029.172
EC Number	232-089-9
PubChem CID	24580
RTECS number	OP1050000 (anhydrous) OP0893500 (tetrahydrate)
UNII	IGA15S9H40 Y
InChI InChI=1S/Mn.H2O4S/c;1-5(2,3)4/h;(H2,1,2,3,4)/q+2;/p-2 Y Key: SQQMAOCOWKFBNP-UHFFFAOYSA-L Y InChI=1/Mn.H2O4S/c;1-5(2,3)4/h;(H2,1,2,3,4)/q+2;/p-2 Key: SQQMAOCOWKFBNP-NUQVWONBAV
SMILES [Mn+2].[O-]S([O-])(=O)=O
Properties
Chemical formula	MnSO4
Molar mass	151.001 g/mol (anhydrous) 169.02 g/mol (monohydrate) 223.07 g/mol (tetrahydrate) 277.11 g/mol (heptahydrate)
Appearance	white crystals (anhydrous) pale pink solid (hydrates)
Density	3.25 g/cm 3 (anhydrous) 2.95 g/cm3 (monohydrate) 2.107 g/cm3 (tetrahydrate)
Melting point	710 °C (1,310 °F; 983 K) (anhydrous) 27 °C (tetrahydrate)
Boiling point	850 °C (1,560 °F; 1,120 K) (anhydrous)
Solubility in water	52 g/100 mL (5 °C) 70 g/100 mL (70 °C)
Solubility	Very slightly soluble in methanol insoluble in ether and ethanol.
Magnetic susceptibility (χ)	+13,660·10−6 cm3/mol
Structure
Crystal structure	orthogonal (anhydrous) monoclinic (monohydrate) monoclinic (tetrahydrate)
Hazards
Safety data sheet	ICSC 0290
EU classification (DSD)	Harmful (Xn) Dangerous for the environment (N)
R-phrases	R48/20/22, R51/53
S-phrases	(S2), S22, S61
NFPA 704	0 1 1
Related compounds
Other cations	Chromium(III) sulfate Iron(II) sulfate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N  (what is YN ?)
Infobox references

Manganese(II) sulfate usually refers to the inorganic compound with the formula MnSO₄·H₂O. This pale pink deliquescent solid is a commercially significant manganese(II) salt. Approximately 260 thousand tonnes of manganese(II) sulfate were produced worldwide in 2005. It is the precursor to manganese metal and many other chemical compounds. Mn-deficient soil is remediated with this salt.

Like many metal sulfates, manganese sulfate forms a variety of hydrates: monohydrate, tetrahydrate, pentahydrate, and heptahydrate. The monohydrate is most common. All of these salts dissolve to give faintly pink solutions of the aquo complex [Mn(H₂O)₆]²⁺. The pale pink colour of Mn(II) salts is highly characteristic.

Typically, manganese ores are purified by their conversion to manganese(II) sulfate. Treatment of aqueous solutions of the sulfate with sodium carbonate leads to precipitation of manganese carbonate, which can be calcined to give the oxides MnO_x. In the laboratory, manganese sulfate can be made by treating manganese dioxide with sulfur dioxide:

It can also be made by mixing potassium permanganate with sodium hydrogen sulfate and hydrogen peroxide.

Manganese sulfate is a by-product of various industrially significant oxidations that use manganese dioxide, including the manufacture of hydroquinone and anisaldehyde.