Cadmium hydroxide is an inorganic compound with the formula Cd(OH)2. It is an ionic compound with a white crystal. It is a key compound in nickel-cadmium batteries. Cadmium hydroxide is more basic than zinc hydroxide.
| Name | Cadmium hydroxide | EINECS | 244-168-5 |
| CAS No. | 21041-95-2 | Density | 4.79 g/cm3 |
| PSA | 40.46000 | LogP | -0.35610 |
| Solubility | water: 0.026 g/100 mL | Melting Point | 130 °C
|
| Formula | CdH2O2 | Boiling Point | 300 °C |
| Molecular Weight | 146.42 | Flash Point | N/A |
| Transport Information | UN 2570 | Appearance | white crystal or powder |
Appearance and properties: white crystal or powder
Density: 4.79 g/mL at 25 °C(lit.)
Boiling point: 100ºC at 760mmHg
Melting point: 232 °C(lit.)
Storage conditions: Warehouse ventilation Low temperature dry steam pressure: 24.5mmHg at 25°C
Production method
1. Add solid KOH to cadmium iodide (CdIn aqueous solution of I2), amorphous Cd(OH)2 precipitates; Heat it to dissolve. The hot solution is left standing and slowly cooled, that is, white Cd(OH)2 crystals are precipitated.
2. Cd(OH)2 microcrystals can be prepared by adding slightly excessive hot sodium hydroxide solution without carbonate into hot cadmium nitrate solution. The precipitation is filtered, washed with distilled water boiled to remove CO2, and dried at 40 ~ 50℃ to obtain Cd(OH)2.
Use
It is used for making nickel-cadmium batteries, metal surface treatment and gas chromatography analysis.
Uses of Cadmium hydroxide: it is generated in storage battery anodes, in nickel-cadmium and silver-cadmium storage batteries in its discharge. The hydroxide is used in place of cadmium oxide for variety of operations.
Ni(OH)2 + Cd → Cd(OH)2 + Ni
When you are using this chemical, please be cautious about it. As a chemical, it is harmful to aquatic organisms, may cause long-term adverse effects in the aquatic environment. What's more, it is harmful by inhalation, in contact with skin and if swallowed. During using it, this material and its container must be disposed of as hazardous waste and avoid release to the environment.
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