sodium sulfate

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sodium sulfate,

chemical compound, Na2SO4. It is a white, orthorhombic crystalline compound at ordinary temperatures; above 100°C; it assumes a monoclinic structure, and above about 250°C; it assumes a hexagonal structure. Sodium sulfate is soluble in cold water and very soluble in hot water. It forms two hydrates; the decahydrate is Glauber's saltGlauber's salt,
common name for sodium sulfate decahydrate, Na2SO4·10H2O; it occurs as white or colorless monoclinic crystals. Upon exposure to fairly dry air it effloresces, forming powdery anhydrous sodium sulfate.
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. Anhydrous sodium sulfate is found in nature as the mineral thenardite. The major commercial source of sodium sulfate is salt cake, a byproduct of the production of hydrochloric acid from sodium chloride (common salt) by treatment with sulfuric acid. It is obtained (with other chemicals) by evaporation of natural brines. It is also obtained as a byproduct of viscose rayon manufacture and in several other, less important ways. The principal use of sodium sulfate is in processing wood pulp for making kraft paper. It is also used in glass manufacture, textile dyeing, and synthetic detergents.

Sodium Sulfate

 

Na2SO4, a salt; colorless crystals. Occurs naturally as the mineral thenardite. Density, 2.698 g/cm3; melting point, 884°C. Solubility in water, 16.3 percent at 20°C and 29.8 percent at 100°C. Anhydrous Na2SO4 is stable at temperatures above 32.384°C; lower temperatures induce the crystallization of Na2So4·10H2O. In nature, this crystal hydrate forms the mineral mirabilite (Glauber’s salt). Double salts of sodium sulfate with other sulfates, such as astrakhanite, Na2SO4·MgSO4 · 4H2O, and glauberite, Na2SO4·CaSo4 are also known.

Large quantities of sodium sulfate are found in brine and in the bottom deposits of chloride-sulfate salt lakes and the gulf of Kara-Bogaz-Gol (USSR). The reaction 2NaCL + MgSO4⇆MgCl2 + Na2So4 takes place there upon a reduction in temperature. Sodium sulfate crystallizes in the form of mirabilite. Another method for the preparation of Na2SO4 is the reaction of NaCl and H2SO4 in special “sulfate” furnaces at 500°-55O°C, which also yields hydrochloric acid.

Sodium sulfate is used in glass-making, the manufacture of sulfate cellulose, soap-making, tanning, nonferrous metallurgy, and textile manufacture, as well as in medicine and veterinary science (as a laxative). Sodium bisulfate, NaHSO4, and sodium disulfate (pyrosulfate), Na2S2O7, are used in the same way as KHSO4 and K2S2O7.

sodium sulfate

[′sōd·ē·əm ′səl‚fāt]
(inorganic chemistry)
Na2SO4 Crystalline compound, melts at 888°C, soluble in water; used to make paperboard, kraft paper, glass, and freezing mixtures.
References in periodicals archive ?
After the completion of reaction, the reaction mixture was washed with H2O (3x20 mL) the resulting organic layer was dried over anhydrous Na2SO4, filtered and concentrated in vacuo to affordproduct(s) as crystalline solids.
1 mV), which is attributed to the compact structure; while for the substrates kept long enough in Na2SO4 solution, the corrosion potential shifts to more cathodic values.
H2SO4 was added into the solution to convert NaHSO4 into Na2SO4 in acidification tank and gain filtered and concentrated in a concentration tank.
Commercial grade NaCl, Na2SO4, CaCl2 and MgSO4 salts were thoroughly mixed in the proportion of 3: 4: 2: 1 to develop artificial EC/SAR of 5/25, 6/30 on 50% field capacity moisture contents in addition to original soil status comparison.
In most salt-alkaline soil of northeast China, the main harmful salts are NaCl, Na2SO4, NaHCO3 and Na2CO3, coming from neutral salts (Yang et al.
Acetic anhydride N-bromosuccinimide (NBS) NaCl MgCl2 Na2SO4 CaCl2 acetone and ethanol all of analytical grade were obtained from Merck.
Then the benzene phase was pooled, dehydrated with Na2SO4 and evaporated to dryness using rotary evaporator.
Cells grown on suitable nutrient medium containing carbon nitrogen sources and inorganic salts (NaCl Na2SO4 KCl NaHCO3 KBr H3BO3 MgCl2.
Anhydrous Na2SO4 was used for dehydration of organic solvents after burning for overnight at 650 oC in a furnace (F 6000, Barnstead Thermolyne Co.
Growth, ion and solute contents of sorghum grown under NaCl and Na2SO4 salinity stress.
The oil was separated from water by using n-hexane (HPLC grade) that was dried over analytical reagent grade anhydrous Na2SO4 and then stored at 4 ?
The organic phase was dried over Na2SO4, filtered, concentrated under reduced pressure.