35103-79-8
Cesium hydroxide monohydrate
CAS: 35103-79-8
Molecular Formula: CsH3O2
35103-79-8 - Names and Identifiers
35103-79-8 - Physico-chemical Properties
| Molecular Formula | CsH3O2 |
| Molar Mass | 167.93 |
| Density | 3.68g/mLat 25°C(lit.) |
| Melting Point | 272.3 °C |
| Water Solubility | SOLUBLE WITH EXOTHERMIC REACTION |
| Appearance | Powder |
| Color | Dark green to brown to black to bluish-red |
| Exposure Limit | ACGIH: TWA 2 mg/m3NIOSH: TWA 2 mg/m3 |
| Merck | 14,2013 |
| Sensitive | Air Sensitive & Hygroscopic |
| Physical and Chemical Properties | White, gray or yellow crystal, chemical formula CsOH. Molecular weight 149.91. The specific gravity was 3.675. Melting point 272.3 °c. Hygroscopic, soluble in water, strong alkaline aqueous solution. Cesium hydroxide is the strongest base known and is called the King of bases. A hot concentrated Cesium hydroxide solution reacts rapidly with nickel or silver. The solution was placed in a platinum vessel and heated to 180 °c for dehydration of the monohydrate. Heating up to 400 °c was continued to further dehydrate into the anhydrate. Both solids and solutions can absorb carbon dioxide from air. It reacts with carbon monoxide at high temperature to form cesium formate, cesium oxalate and cesium carbonate. preparation method: it can be prepared by hydrolysis of cesium amalgam or by reaction of cesium sulfate with barium hydroxide. Application: it can be used as a reagent for desulfurization of heavy oil, and used for preparing alkaline battery electrolyte and polymerization catalyst used at low temperature (down to -50 ° C.). corrosive: highly irritating to the skin. Applied to the skin of rabbits, the corrosive effect was multiplied by KOH. Acute toxicity: toxic. Rats were administered with LD50100mg/kg intraperitoneally, and rats were given LD501026mg/kg orally. The maximum allowable concentration in the air of the working environment is 2mg/m3 in the United States. FIG. 1 shows the molecular structure of Cesium hydroxide. |
35103-79-8 - Risk and Safety
| Hazard Symbols | C - Corrosive |
| Risk Codes | R22 - Harmful if swallowed R35 - Causes severe burns |
| Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S36/37/39 - Wear suitable protective clothing, gloves and eye/face protection. S45 - In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) S37/39 - Wear suitable gloves and eye/face protection S27 - Take off immediately all contaminated clothing. |
| UN IDs | UN 2682 8/PG 2 |
| WGK Germany | 3 |
| RTECS | FK9800000 |
| FLUKA BRAND F CODES | 3 |
| HS Code | 28259090 |
| Hazard Class | 8 |
| Packing Group | II |
35103-79-8 - Reference Information
| Related chemical reaction | 1. Cesium hydroxide and magnesium or calcium are heated in a hydrogen stream to generate cesium and hydrogen, and magnesium oxide or calcium oxide can be generated at the same time, 2CsOH 2Mg = = 2Cs H2 2MgO. 2. Cesium hydroxide solution reacts with elemental aluminum to generate tetrahydroxyaluminum (Ⅲ) acid cesium and hydrogen, 2CsOH 2Al 6H2O = 2Cs[Al(OH)4] 3H2. 3. Cesium hydroxide reacts with chlorine to generate cesium hypochlorite when not heated, and cesium chlorate when heated; at the same time, both can generate cesium chloride and water, 6CsOH 3Cl2 = CsClO3 5CsCl 3H2O. 4. Cesium hydroxide reacts with iodine to generate cesium iodide, cesium iodate and water, 6CsOH 3I2 = 5CsI CsIO3 3H2O. 5. Cesium hydroxide and iron react at high temperature to generate elemental cesium, ferric oxide and hydrogen. 6. Cesium hydroxide reacts with the following acids to generate cesium salts of the corresponding acids. Figure 2 shows the cesium salt of the corresponding acid formed by the interaction of cesium hydroxide and acid. 7. Cesium hydroxide reacts with aluminum hydroxide to generate cesium tetrahydroxyaluminum (Ⅲ) acid, CsOH Al(OH)3 = Cs[Al(OH)4]. 8. Cesium hydroxide reacts with the following chlorides to generate cesium chloride, CsOH NH4Cl = = CsCl NH3 H2O. 9. cesium hydroxide reacts with the following oxides to produce different products,(1) csOH CO2 = csHCo3 (2) 2csOH SiO2 = cs2 [SiO2(OH)2](3) csOH So2 = csHSO3. |
| Incompatibility | Cesium hydroxide is the strongest known base and must be stored in a silver or platinum container and is not in contact with air because it reacts with glass and carbon dioxide. |
| use | 1, used as an electrode in alkaline storage batteries at sub-zero temperature. 2. Used as a polymerization catalyst for cyclosilane. 3. Cesium hydroxide is also used as a raw material for the production of other cesium salts (such as cesium chloride, and cesium chloride is used to produce metallic cesium). Metal cesium is used in electronic components. A strong alkali used as a battery electrolyte, polymerization catalyst. Cesium hydroxide is generally used to produce various basic raw materials for cesium salt products, and is also used in organic reagents, pharmaceutical intermediates, glass industry and ceramic industry. The raw materials for preparing various cesium salts are used in the glass ceramic industry. |
| harmful effects and poisoning symptoms | cesium hydroxide is not a sensitizor of the skin, but at a concentration of 5%, it is very irritating and corrosive to the eyes. The toxicity caused by ingestion is lower than that of KOH. 5% CsOH does not cause damage to human skin and is safe, while 5% KOH has mild irritation to skin. |
| store | sealed and dry. |
| transportation requirements | inorganic alkaline corrosive articles. Dangerous code number: 95003. |
| production method | this product is made from hydroxide. It is obtained by rapidly evaporating its concentrated aqueous solution above 100 ℃. |
Last Update：2024-04-10 22:29:15
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