Manganese(II) sulfate

Manganese(II) sulfate

MnSO4 sample and its original bottle. The compound is more pinkish in person.
Names
IUPAC name Manganese(II) sulfate
Systematic IUPAC name Manganese(II) sulfate
Other names Manganese sulfate
Identifiers
Jmol-3D images	Image
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 solid (anhydrous) Pink crystalline solid (hydrated)
Density	3.25 g/cm3 (anhydrous) 2.95 g/cm3 (monohydrate) 2.107 g/cm3 (tetrahydrate)
Melting point	710 °C (1,310 °F; 983 K) (anhydrous) 27 °C (80.6 °F; 300.15 K) (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 (7 °C)
Solubility	Soluble in ethanol, methanol Insoluble in diethyl ether, toluene
Hazards
Safety data sheet	DoGEE (monohydrate)
Related compounds
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Manganese(II) sulfate is the sulfate salt of manganese, with the formula MnSO₄. Although the anhydrous salt is white, its hydrates are pinkish in color.

Properties

Chemical

Manganese(II) sulfate will precipitate as manganese hydroxide when mixed with a strong base, such as sodium hydroxide.

Physical

Manganese sulfate is a pinkish crystalline salt, soluble in water, as well as primary alcohols, though insoluble in aprotic solvents, such as benzene or diethyl ether. It is most often encountered as monohydrate form, though other hydrates, like tetrahydrate, pentahydrate, and heptahydrate also exist.

Availability

Manganese sulfate is sold by various chemical suppliers.

Preparation

There are a few ways to make manganese(II) sulfate.

One involves the direct reaction of sulfuric acid with manganese metal:

H₂SO₄ + Mn → MnSO₄ + H₂

This reaction however, does not work with manganese dioxide, which is more available that manganese metal. There are a few ways around though:

One way is to react manganese dioxide with oxalic acid and then react the resulting manganese oxalate/carbonate with sulfuric acid.

Another method involves bubbling sulfur dioxide through a suspension of manganese dioxide in water, and the filtering the solution.

MnO₂ + SO₂ → MnSO₄

You can also dissolve manganese alloys in sulfuric acid, however the resulting manganese sulfate will be contaminated with iron sulfate as well as other sulfates.

Projects

• Make very pure manganese dioxide

References

Relevant Sciencemadness threads

• Quick Question about Manganese(II) Sulphate
• Insoluble Manganese (II) Sulfate, monohydrate