Mercury (II) Sulfate CAS#7783-35-9
Formula: HgSO₄
Appearance: White crystalline powder or small colorless crystals.
Odor: Odorless.
Solubility: Slightly soluble in water (decomposes in hot water); soluble in dilute acids and solutions of alkali chlorides.
Stability: Stable under normal conditions, but decomposes on heating to release toxic mercury vapor and sulfur oxides. Light-sensitive.
Product Details
Key Properties
| Property | Value |
|---|---|
| Molar Mass | 296.65 g/mol |
| Melting Point | Decomposes at ~450 °C |
| Density | 6.47 g/cm³ |
| Water Solubility | 0.005 g/100 mL (20 °C) |
| pH (slurry) | Acidic (due to slight hydrolysis) |
| Storage | Store in sealed, cool, dry, dark place |
Safety & Hazard Information (EXTREMELY TOXIC)
| Item | Details |
|---|---|
| Hazard Class | 6.1 (Toxic), Class 8 (Corrosive) |
| UN Number | UN 1645 |
| Risk Statements | R26/27/28 (Very toxic by inhalation, skin contact, ingestion)R33 (Cumulative effects)R50/53 (Very toxic to aquatic life) |
| Safety Statements | S13 (Keep away from food/feed)S28 (After skin contact, wash immediately)S45 (Seek medical help immediately)S60/S61 (Dispose as hazardous waste; avoid environmental release) |
| Target Organs | Nervous system, kidneys, respiratory system. Cumulative poison. |
Primary Applications
Laboratory Analysis: Key reagent in COD (Chemical Oxygen Demand) determination to mask chloride ions.
Organic Synthesis: Catalyst in hydration of alkynes (e.g., production of acetaldehyde from acetylene).
Other Uses: Historical use in electroplating and as a fungicide (now banned/restricted).
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