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223492

Sigma-Aldrich

Potassium sulfate

ACS reagent, ≥99.0%, powder

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Linear Formula:
K2SO4
CAS Number:
Molecular Weight:
174.26
EC Number:
MDL number:
PubChem Substance ID:
NACRES:
NB.24

grade

ACS reagent

Quality Level

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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1 of 4

This Item
221325P07721.05152
vibrant-m

223492

Potassium sulfate

Essential Grade
vibrant-m

221325

Potassium sulfate

Essential Grade
vibrant-m

P0772

Potassium sulfate

-
vibrant-m

1.05152

Potassium sulfate

-
assay

≥99.0%

assay

≥99.0%

assay

≥99.0%

assay

99.999%

form

powder

form

powder or crystals

form

powder

form

solid

pH

5.5-5.8 (25 °C, 5%)

pH

5.5-5.8 (25 °C, 5%)

pH

-

pH

5.5-8.5 (20 °C, 50 g/L in H2O)

impurities

≤0.01% insolubles, ≤5 ppm N compounds

impurities

≤0.01% insolubles, ≤5 ppm N compounds

impurities

-

impurities

-

cation traces

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

cation traces

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

cation traces

-

cation traces

-

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. 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. It can be prepared by reacting phosphogypsum and potassium chloride. K2SO4 can form needle-like mullite particles on heating with aluminum sulfate and silicon dioxide. Its application to the soil has shown to minimize bronzing of rice plants.

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.
Potassium sulfate may be used in the preparation of needlelike mullite particles. It may be used as a buffer for minimizing the adsorption of proteins on fused-silica capillaries in capillary zone electrophoresis.

Storage Class Code

13 - Non Combustible Solids

WGK

WGK 1

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable


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Conversion of phosphogypsum to potassium sulfate.
Aagli A, et al.
Journal of Thermal Analysis and Calorimetry, 82(2), 395-399 (2005)
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)
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)
Sulfonation of benzocrown ethers by potassium sulfate in polyphosphoric acid.
Grebenyuk AD, et al.
Chemistry of Heterocyclic Compounds, 37(7), 822-826 (2001)
Eagleson M.
Concise Encyclopedia Chemistry, 890-890 (1994)

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