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Potassium Sulfate

Potassium Sulfate

Potassium Sulfate

Chemical Name:  Potassium sulfate
Other Names: Sulfate of potash, acid dipotassium salt
CAS Number: 7778-80-5
Other Codes: EEC No.(EINECS/ELINCS)  231-915-5
Molecular weight:  174.26 g/mol
Melting point:  1069°C
Boiling point:  1689°C
pH ≈7
Density:  2.332 g/cm3
Solubility:  1g dissolves in 8.3mL water, 4mL boiling water, 75 mL glycerol
Solubility in water is decreased by KCl or (NH4)2SO4
Insoluble in alcohol, most organic solvents
Stability:  Stable under normal temperatures and  pressures.  If heated above  decomposition temperatures (>700°C) toxic gases/vapors may be released (SOx, K2O).
Hazardous Polymerization:  Will not occur.
Physical Properties: Colorless or white, odorless, hard, bitter crystals, or white granules or powder. 

Potassium Sulfate Uses :
Potassium sulfate is commonly used as a specialty fertilizer on crops that are sensitive to soil chloride levels, such as potatoes, lettuce, tobacco, avocados, peaches, and legumes. It is also used in cases where chloride buildup may be problematic. Mined and synthesized potassium sulfate are identical, and thus are functionally interchangeable. Worldwide, almost all technical grade potassium sulfate (>99%) is used in agriculture.  The remaining SOP is used in a wide range of industrial uses and for manufacturing potassium alum, potassium carbonate, and glass (Horn 2000).