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Sulfate compounds arise when cations combine with the anion SO42-. Often this combination results in an ionic compound, although sulfates can engage in covalent bonding with most elements. The metal complex PtSO4P(C6H5)32 is clearly covalent Pt-O bonding. Dialkylsulfates, such as dimethylsulfate are covalent, distillable species. Many sulfate salts are highly soluble in water. Exceptions include calcium sulfate, strontium sulfate, and barium sulfate, which are poorly soluble.
| Appearance: | Grayish-white powder or rhombic crystals. | Odor: | Odorless. |
| Solubility: | Soluble in water. | Density: | 3.097 (Anhydrous) |
| % Volatiles by volume @ 21C (70F): | 0 | Melting Point: | 480C (896F) |
Inhalation: No information found, but compound should be handled as a potential health hazard. Inhalation may cause irritation to the upper respiratory tract. Symptoms may include coughing, shortness of breath and chest pain. Other symptoms may parallel those from ingestion.
| Purity as MgSo4 7H2O | > 99% to 99.5% | Magnesium Sulphate as MgSo4 | > 48.5% |
| Magnesium Oxide as Mgo | > 16% to 17% | Magnesium as Mg | > 9.6% |
| PH of 5% aqueous solution | 7 + 0.5 | Sulphates of K and Ca | < 0.1% each |
| Chlorides of K and Ca | < 0.1% each | Chlorides of Cl | < 300 ppm |
| Heavy metals as Pb | < 2 ppm | Arsenic as As2O3 | < 2 ppm |
| Iron as Fe | < 20 ppm | Calcium as Ca | < 300 ppm |
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