CASR |
: | 7446-20-0 |
Molecular Formula |
: | ZnSO4.7H2O |
Molecular Weight |
: | 287.54 |
| Specifications | |
|---|---|
| Appearance: | White or almost white, crystalline powder or colourless, transparent crystals, efflorescent |
| Solubility: | Very soluble in water, practically insoluble in ethanol (96 per cent) and diethyl ether. |
| Identification (Sulfate): | A white precipitate is formed. |
| Identification for Zinc: | A flocculent white precipitate is formed |
| Appearance of solution: | clear and colourless solution |
| Free acid: | Passes test |
| Chloride (Cl): | NMT 0.0005% |
| Heavy metals (as Pb): | NMT 0.0010% |
| Arsenic (As): | NMT 0.0002% |
| Cadmium(Cd): | NMT 0.0002% |
| Iron (Fe): | NMT 0.001% |
| Mercury(Hg): | NMT 0.0005% |
| Nickel (Ni): | NMT 0.0005% |
| Lead: | NMT 0.0004% |
| Selenium (Se): | NMT 0.003% |
| Thallium (Tl): | NMT 0.0002% |
| Alkalis and alkaline earth metals: | NMT 0.5% |
| Loss on drying at 105°C: | 35.5 - 38.5% |
