“Manganese(II) sulfate”的意思、由来-开放百科全书

词条

Manganese(II) sulfate

释义

Structure
Applications and production
Natural occurrence
References

{{chembox
| Verifiedfields = changed
| Watchedfields = changed
| verifiedrevid = 400106050
| Name = Manganese(II) sulfate
| ImageFile = Manganese(II) sulfate close-up.jpg
| ImageSize =
| ImageCaption = Manganese(II) sulfate monohydrate
| ImageFile1 = Manganese%28II%29-sulfate-tetrahydrate-sample.jpg
| ImageSize1 =
| ImageCaption1 = Manganese(II) sulfate tetrahydrate
| IUPACName = Manganese(II) sulfate
| OtherNames =
|Section1={{Chembox Identifiers
| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}
| ChemSpiderID = 22984
| UNII_Ref = {{fdacite|correct|FDA}}
| UNII = IGA15S9H40
| ChEMBL_Ref = {{ebicite|changed|EBI}}
| ChEMBL = 1200557
| InChI = 1/Mn.H2O4S/c;1-5(2,3)4/h;(H2,1,2,3,4)/q+2;/p-2
| InChIKey = SQQMAOCOWKFBNP-NUQVWONBAV
| SMILES = [Mn+2].[O-]S([O-])(=O)=O
| StdInChI_Ref = {{stdinchicite|correct|chemspider}}
| StdInChI = 1S/Mn.H2O4S/c;1-5(2,3)4/h;(H2,1,2,3,4)/q+2;/p-2
| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}}
| StdInChIKey = SQQMAOCOWKFBNP-UHFFFAOYSA-L
| CASNo = 7785-87-7
| CASNo_Ref = {{cascite|correct|CAS}}
| CASNo2_Ref = {{cascite|changed|??}}
| CASNo2 = 10034-96-5
| CASNo2_Comment = (monohydrate)
| CASNo3_Ref = {{cascite|changed|??}}
| CASNo3 = 10101-68-5
| CASNo3_Comment = (tetrahydrate)
| PubChem = 24580
| EINECS = 232-089-9
| RTECS = OP1050000 (anhydrous)
OP0893500 (tetrahydrate)
|Section2={{Chembox Properties
| Formula = MnSO₄
| MolarMass = 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)
| Solubility = 52 g/100 mL (5 °C)
70 g/100 mL (70 °C)
| SolubleOther = Very slightly soluble in methanol
insoluble in ether and ethanol.
| MeltingPtC = 710
| MeltingPt_notes = (anhydrous)
27 °C (tetrahydrate)
| BoilingPtC = 850
| BoilingPt_notes = (anhydrous)
| MagSus = +13,660·10⁻⁶ cm³/mol
|Section3={{Chembox Structure
| Coordination =
| CrystalStruct = orthogonal (anhydrous)
monoclinic (monohydrate)
monoclinic (tetrahydrate)
| Dipole =
|Section7={{Chembox Hazards
| ExternalSDS = ICSC 0290
| EUClass = Harmful (Xn)
Dangerous for the environment (N)
| NFPA-H = 1
| NFPA-F = 0
| NFPA-R = 1
| RPhrases = {{Rlink|R48/20/22}}, {{Rlink|R51/53}}
| SPhrases = {{S2}}, {{S22}}, {{S61}}
|Section8={{Chembox Related
| OtherAnions =
| OtherCations = Chromium(III) sulfate
Iron(II) sulfate
| OtherCompounds =
}}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.^[1]

Structure

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.

Applications and production

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:^[2]

MnO₂ + SO₂ → MnSO₄

It can also be made by mixing potassium permanganate with sodium bisulfate 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.^[1]

Electrolysis of manganese sulfate yields manganese dioxide, which is called EMD for electrolytic manganese dioxide. Alternatively oxidation of manganese sulfate with potassium permanganate yields the so-called chemical manganese dioxide (CMD). These materials, especially EMD, are used in dry-cell batteries.^[1]

Natural occurrence

Manganese(II) sulfate minerals are very rare in the nature and always occur as hydrates. The monohydrate is called szmikite; tetrahydrate = ilesite; hexahydrate (the most rare) = chvaleticeite; pentahydrate = jôkokuite; heptahydrate = mallardite.^[3]

References

1. ^¹²Arno H. Reidies "Manganese Compounds" Ullmann's Encyclopedia of Chemical Technology 2007; Wiley-VCH, Weinheim. {{DOI|10.1002/14356007.a16_123}}
2. ^{{OrgSynth | author = John R. Ruhoff | title = n-Heptanoic acid | collvol = 2 | collvolpages = 315 | year = 1943 | prep = cv2p0315}}
3. ^www.mindat.org

3 : Manganese compounds|Sulfates|Deliquescent substances

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