| Physical Description |
Dry Powder; Dry Powder, Liquid, Other Solid; Dry Powder, Other Solid; Dry Powder, Pellets or Large Crystals; Dry Powder, Pellets or Large Crystals, Liquid; Dry Powder, Water or Solvent Wet Solid; Gas or Vapor; Liquid; Liquid, Other Solid; Other Solid; Pellets or Large Crystals; Water or Solvent Wet Solid |
| Color/Form |
Powder or orthorhombic bipyramidal crystals |
| Odor |
Odorless |
| Taste |
Bitter saline taste |
| Melting Point |
884 °C |
| Solubility |
In water, 28.1 g/100 g water at 25 °C |
| Density |
2.671 |
| Stability/Shelf Life |
Stable under recommended storage conditions. |
| Decomposition |
When heated to decomposition it emits toxic fumes of sulfur oxides and sodium oxide. |
| Viscosity |
2.48 (22% solution at 20 °C) |
| Corrosivity |
The rates of corrosion of iron and steel in water are a function of the specific mineral quality as well as the alkalinity and pH values. Sodium sulfate ... is a strong contributor to the rate of corrosion. For example, in water with 400 mg/l of alkalinity (as CaCO3) at pH 7, the corrosion rate will be zero at 200 mg/l of Na2SO4, but when the concentration of sodium sulfate is 400 mg/l, the corrosion rate will be about 100 mg per square cm per day. |
| pH |
Neutral or slightly alkaline to litmus paper (5 % solution) |
| Refractive Index |
4.76 g/100 cc water at 0 °C, 42.7 g/100 cc water at 100 °C; soluble in glycerol; insoluble in alcohol; index of refraction: 1.484, 1.477, 1.471 /Natural thenardite/ |
| Dissociation Constants |
Sodium sulphate dissociates into Na+ and SO4- ions in water. |
| Relative Evaporation Rate |
Evaporation at 20 °C is negligible |
| Other Experimental Properties |
Transition point to anhydrous form is 24.4 °C; white, rhombic or tetragonal; 19.5 g/100 cc water at 0 °C, 44 g/100 cc water at 20 °C/Sodium sulfate heptahydrate/ |
| Chemical Classes |
Other Classes -> Sulfur Compounds |
