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Manganese(III)-ammonium sulfate

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   Manganese(III)-ammonium sulfate   
Names: ammonium-manganese(III) sulfate
manganese-ammonium alum
manganic alum
Formula: NH4Mn(SO4)2 (anhydrous)
NH4Mn(SO4)2 · 12H2O (dodecahydrate)
Molar mass: 265.099 g/mol (anhydrous)
481.277 g/mol (dodecahydrate)
Crystal system: cubic (dodecahydrate)
α=90°, β=90°, γ=90°
Shapes:
https://en.crystalls.info/w/uploads/media/3/37/Octahedron.json
Octahedron

Color: pink(extremely dilute)
orange(dilute)
dark-purple(pure)
Stability: decomposes (dodecahydrate)
Hardness: strong
Toxicity: slightly toxic

Description

Inorganic compound, double salt of transitional metal manganese, ammonium ion and inorganic sulfuric acid. Mn(III) disproportionate to Mn(II) and Mn(IV) easily, so sulfuric acid of at least 5mol/L is needed to handle it. From water solutions crystallizes as dodecahydrate.

Precursors

Reaction between manganese(II) sulfate, potassium permanganate and ammonium sulfate in 10mol/L sulfuric acid

Chemical equation:

8MnSO4 + 2KMnO4 + 5(NH4)2SO4 + 8H2SO4 = 10NH4Mn(SO4)2 + K2SO4 + 8H2O


For preparation of 100.00g of manganese(III)-ammonium sulfate dodecahydrate а 25.10g of manganese(ii) sulfate, 6.57g of potassium permanganate and 13.73g of ammonium sulfate is required.



Mix two manganese compounds carefully in sulfuric acid, then add sulfuric acid solution of ammonium sulfate and cool this solution down to crystallize the alum.

Reaction between manganese(II) sulfate, manganese dioxide and ammonium sulfate in 10mol/L sulfuric acid

Chemical equation:

MnSO4 + MnO2 + (NH4)2SO4 + 2H2SO4 = 2NH4Mn(SO4)2 + 2H2O


For preparation of 100.00g of manganese(III)-ammonium sulfate dodecahydrate а 15.69g of manganese(ii) sulfate, 9.03g of manganese dioxide and 13.73g of ammonium sulfate is required.



Mix two manganese compounds carefully in sulfuric acid, then add sulfuric acid solution of ammonium sulfate and cool this solution down to crystallize the alum.

Electrolysis of solution of manganese(II) sulfate in sulfuric acid then add ammonium sulfate

Chemical equation:

(NH4)2SO4 + 2MnSO4 + H2SO4 = 2NH4Mn(SO4)2 + H2↑


For preparation of 100.00g of manganese(III)-ammonium sulfate dodecahydrate а 31.37g of manganese(ii) sulfate and 13.73g of ammonium sulfate is required.



Electrolyze solution with a Pt or PbO2 anode and a cathode in separated cell, until solution becomes purple, then add sulfuric acid solution of ammonium sulfate and cool this solution down to crystallize the alum. If you want mixed crystals with ammonium alum, you can simply electrolyze a solution saturated with ammonium alum containing manganese(ii) sulfate without partitioning, until solution becomes wine-red, and freeze it to crystallize.

Notes

Pure compound is extremely unstable at room temperature, but mixed crystals with ammonium alum are much more stable. Such crystals are formed only at freezing temperature but persist at room temperature, and Mn/Al ratio is lower than source solution due to ion size difference.

Storage conditions

For crystal storing use hermetic vessel with small amount of saturated solution at the bottom or place wadding moistened with such solution. You can use such alternatives as vessel with vaseline or vegetable oil, organic non-hygroscopic solvent (kerosene, benzine or paraffin). Also you can use acrylate polymer or another kinds of solidifying plastic.

Solubility

Insoluble in ethanol and acetone.


Gallery


Sources


Navigation


   Sulfates
Simple

Aluminum sulfate (Al2(SO4)3) • Ammonium sulfate ((NH4)2SO4) • Calcium sulfate (CaSO4) • Cadmium sulfate (CdSO4) • Cerium(III) sulfate (Ce2(SO4)3) • Cerium(IV) sulfate (Ce(SO4)2) • Chromium(III) sulfate (Cr2(SO4)3) • Cobalt(II) sulfate (CoSO4) • Copper(II) sulfate (CuSO4) • Gadolinium sulfate (Gd2(SO4)3) • Holmium sulfate (Ho2(SO4)3) • Hydrazine sulfate (N2H4 · H2SO4) • Iron(II) sulfate (FeSO4) • Iron(III) sulfate (Fe2(SO4)3) • Lanthanum sulfate (La2(SO4)3) • Lithium sulfate (Li2SO4) • Magnesium sulfate (MgSO4) • Manganese(II) sulfate (MnSO4) • Neodymium sulfate (Nd2(SO4)3) • Nickel sulfate (NiSO4) • Potassium sulfate (K2SO4) • Praseodymium(III) sulfate (Pr2(SO4)3) • Rubidium sulfate (Rb2SO4) • Sodium hydrosulfate (NaHSO4) • Sodium sulfate (Na2SO4) • Yttrium sulfate (Gd2(SO4)3) • Zinc sulfate (ZnSO4)

Alums

Aluminum-ammonium sulfate (NH4Al(SO4)2) • Aluminum-potassium sulfate (KAl(SO4)2) • Chromium(III)-ammonium sulfate (NH4Cr(SO4)2) • Chromium(III)-potassium sulfate (KCr(SO4)2) • Cobalt(III)-ammonium sulfate (NH4Co(SO4)2) • Indium(III)-potassium sulfate (KIn(SO4)2) • Iron(III)-ammonium sulfate (NH4Fe(SO4)2) • Iron(III)-potassium sulfate (KFe(SO4)2) • Manganese(III)-ammonium sulfate (NH4Mn(SO4)2) • Vanadium(III)-ammonium sulfate (NH4V(SO4)2)

Tutton's salts

Chromium(II)-ammonium sulfate ((NH4)2Cr(SO4)2) • Cobalt(II)-ammonium sulfate ((NH4)2Co(SO4)2) • Cobalt(II)-potassium sulfate (K2Co(SO4)2) • Copper(II)-ammonium sulfate ((NH4)2Cu(SO4)2) • Copper(II)-potassium sulfate (K2Cu(SO4)2) • Iron(II)-ammonium sulfate ((NH4)2Fe(SO4)2) • Iron(II)-potassium sulfate (K2Fe(SO4)2) • Magnesium-ammonium sulfate ((NH4)2Mg(SO4)2) • Magnesium-potassium sulfate (K2Mg(SO4)2) • Magnesium-potassium sulfate-chromate (K2CrO4 · MgSO4) • Manganese(II)-ammonium sulfate ((NH4)2Mn(SO4)2) • Manganese(II)-potassium sulfate (K2Mn(SO4)2) • Nickel-ammonium sulfate ((NH4)2Ni(SO4)2) • Nickel-potassium sulfate (K2Ni(SO4)2) • Vanadium(II)-ammonium sulfate ((NH4)2V(SO4)2) • Zinc-ammonium sulfate ((NH4)2Zn(SO4)2) • Zinc-potassium sulfate (K2Zn(SO4)2) •

Double salts

Copper(II)-iron(II) sulfate ((Cu,Fe)SO4) • Iron(II)-magnesium sulfate ((Fe,Mg)SO4) • Lithium-potassium sulfate (KLiSO4) • Sodium-ammonium sulfate (NaNH4SO4) • Zinc-sodium sulfate (Na2Zn(SO4)2) •

Adducts

Triglycine sulfate ((NH2CH2COOH)3 · H2SO4) • Glutamic acid sulfate (C5H9NO4 · H2SO4)

Complexes

Cerium(III) sulfocerate(IV) (Ce4[Ce(SO4)4]3) • Glycinecopper(II) sulfate ([Cu(NH2CH2COOH)]SO4) • Hexakarbamatzinc sulfate ([(CON2H4)6Zn]SO4) • Tetraamminecopper(II) sulfate ([Cu(NH3)4]SO4) • Tris(hydroxymethil)methanoaminecopper(II) sulfate ([Cu(NH2C(CH2OH)3)4]SO4)


   Ammonium compounds
Salts

Ammonium citrate ((NH4)3C3H5O(COO)3) • Ammonium chloride (NH4Cl) • Ammonium dichromate ((NH4)2Cr2O7) • Ammonium dihydrophosphate (NH4H2PO4) • Ammonium nitrate (NH4NO3) • Ammonium perrhenate (NH4ReO4) • Ammonium sulfate ((NH4)2SO4) • Ammonium succinate ((NH4)2C4H4O4) • Ammonium tetraborate ((NH4)2B4O7) • Ammonium thiocyanate (NH4NCS)

Double salts

Aluminum-ammonium sulfate (NH4Al(SO4)2) • Calcium-ammonium nitrate (5Ca(NO3)2 · NH4NO3) • Chromium(II)-ammonium sulfate ((NH4)2Cr(SO4)2) • Chromium(III)-ammonium sulfate (NH4Cr(SO4)2) • Cobalt(II)-ammonium sulfate ((NH4)2Co(SO4)2) • Cobalt(III)-ammonium sulfate (NH4Co(SO4)2) • Copper(II)-ammonium sulfate ((NH4)2Cu(SO4)2) • Iron(II)-ammonium sulfate ((NH4)2Fe(SO4)2) • Iron(III)-ammonium sulfate (NH4Fe(SO4)2) • Magnesium-ammonium sulfate ((NH4)2Mg(SO4)2) • Manganese(II)-ammonium sulfate ((NH4)2Mn(SO4)2) • Manganese(III)-ammonium sulfate (NH4Mn(SO4)2) • Nickel-ammonium sulfate ((NH4)2Ni(SO4)2) • Sodium-ammonium sulfate (NaNH4SO4) • Vanadium(II)-ammonium sulfate ((NH4)2V(SO4)2) • Vanadium(III)-ammonium sulfate (NH4V(SO4)2) • Zinc-ammonium sulfate ((NH4)2Zn(SO4)2)

Complexes

Ammines • Ammonium dioxalatocuprate(II) ((NH4)2[Cu(C2O4)2]) • Ammonium pentachloroferrate(III) ((NH4)2[FeCl5]) • Ammonium tetrachlorocuprate(II) ((NH4)2[CuCl4]) • Ammonium trioxalatoferrate(III) ((NH4)3[Fe(C2O4)3])


   Manganese compounds
Salts

Manganese(II) acetate (Mn(CH3COO)2) • Manganese(II) chloride (MnCl2) • Manganese(II) formate (Mn(COOH)2) • Manganese(II) sulfate (MnSO4)

Double salts

Cerium(III)-cobalt-manganese nitrate (3(Co,Mn)(NO3)2 · 2Ce(NO3)3) • Cerium(III)-manganese nitrate (3Mn(NO3)2 · 2Ce(NO3)3) • Manganese(II)-ammonium sulfate ((NH4)2Mn(SO4)2) • Manganese(III)-ammonium sulfate (NH4Mn(SO4)2) • Manganese(II)-potassium sulfate (K2Mn(SO4)2)


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