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223492

Sigma-Aldrich

Potassium sulfate

ACS reagent, ≥99.0%, powder

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About This Item

Linear Formula:
K2SO4
CAS Number:
7778-80-5
Molecular Weight:
174.26
EC Number:
231-915-5
MDL number:
MFCD00011388
UNSPSC Code:
12352302
PubChem Substance ID:
329752311
NACRES:
NB.24
assay:
≥99.0%
grade:
ACS reagent
form:
powder

grade

ACS reagent

Quality Level

200

agency

suitable for EPA 300

assay

≥99.0%

form

powder

impurities

≤0.01% insolubles
≤5 ppm N compounds

pH

5.5-5.8 (25 °C, 5%)

anion traces

chloride (Cl-): ≤0.001%

cation traces

Ca: ≤0.01%
Fe: ≤5 ppm
Mg: ≤0.005%
Na: ≤0.02%
heavy metals: ≤5 ppm (by ICP)

SMILES string

[K+].[K+].[O-]S([O-])(=O)=O

InChI

1S/2K.H2O4S/c;;1-5(2,3)4/h;;(H2,1,2,3,4)/q2*+1;/p-2

InChI key

OTYBMLCTZGSZBG-UHFFFAOYSA-L

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General description

Potassium sulfate (K2SO4)is a colorless compound having rhombic or hexagonal crystals. It readily forms double salts with the sulfate of trivalent metals, which are known as Alums. It also forms double salts with calcium, magnesium and sodium sulfates.[1] It is widely employed as a fertilizer. K2SO4 can be extracted from various complex salts in nature, such as Kainite, langbeinite and carpathein mineral ores. It can be synthesized by reacting KCl and sulfuric acid, via Mannheim process.
Potassium sulfate is a water-soluble inorganic salt that is commonly used in fertilizers.[2] It can be prepared by reacting phosphogypsum and potassium chloride.[3] K2SO4 can form needle-like mullite particles on heating with aluminum sulfate and silicon dioxide.[4] Its application to the soil has shown to minimize bronzing of rice plants.[5]

Application

Potassium sulfate may be used as a sulfonating agent in the preparation of 4′-dibenzo-18-crown-6-sulfonic acid via sulfonation of dibenzo-18-crown-6.[6]
Potassium sulfate may be used in the preparation of needlelike mullite particles.[4] It may be used as a buffer for minimizing the adsorption of proteins on fused-silica capillaries in capillary zone electrophoresis.[7]

Storage Class

13 - Non Combustible Solids

wgk_germany

WGK 1

flash_point_f

Not applicable

flash_point_c

Not applicable

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Certificates of Analysis (COA)

Lot/Batch Number
WXBF5698V
WXBF4298V
WXBF1695V
WXBD9938V
WXBD9143V

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Sulfonation of benzocrown ethers by potassium sulfate in polyphosphoric acid.
Grebenyuk AD, et al.
Chemistry of Heterocyclic Compounds, 37(7), 822-826 (2001)
Rice bronzing in Nigeria caused by nutrient imbalances and its control by potassium sulfate application.
Yamauchi M.
Plant and Soil, 117(2), 275-286 (1989)
Conversion of phosphogypsum to potassium sulfate.
Aagli A, et al.
Journal of Thermal Analysis and Calorimetry, 82(2), 395-399 (2005)
Eagleson M.
Concise Encyclopedia Chemistry, 890-890 (1994)
Minimizing adsorption of proteins on fused silica in capillary zone electrophoresis by the addition of alkali metal salts to the buffers.
Green JS and Jorgenson JW.
Journal of Chromatography A, 478, 63-70 (1989)
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