Barium hydroxide
Barium hydroxide
CAS: 17194-00-2
Molecular Formula: BaH2O2
Barium hydroxide - Names and Identifiers
| Name | Barium hydroxide |
| Synonyms | Ba(OH)2 BARIUM HYDRATE dihydroxybarium Barium hydroxide BARIUM HYDROXIDE bariumdihydroxide Barium hydroxide, alpha bariumhydroxide(ba(oh)2) Bariumhydroxide,anhydrous Barium hydroxide (Ba(OH)2) |
| CAS | 17194-00-2 |
| EINECS | 241-234-5 |
| InChI | InChI=1/Ba.2H2O/h;2*1H2/q+2;;/p-2/rBaH2O2/c2-1-3/h2-3H |
| InChIKey | RQPZNWPYLFFXCP-UHFFFAOYSA-L |
Barium hydroxide - Physico-chemical Properties
| Molecular Formula | BaH2O2 |
| Molar Mass | 171.34 |
| Density | 2.2g/mLat 25°C(lit.) |
| Melting Point | >300°C(lit.) |
| Boling Point | decomposes at 1032 (calculated) [KNA91] |
| Water Solubility | Soluble in water. |
| Appearance | Solid |
| Color | Clear |
| Odor | no odor |
| Exposure Limit | ACGIH: TWA 0.5 mg/m3NIOSH: IDLH 50 mg/m3; TWA 0.5 mg/m3 |
| Merck | 14,977 |
| PH | 11.27(1 mM solution);12.22(10 mM solution);13.08(100 mM solution) |
| Stability | Stable. Incompatible with acids, carbon dioxide, moisture. |
| Sensitive | Air Sensitive & Hygroscopic |
| Physical and Chemical Properties | Character white monoclinic crystal.
melting point 78 ℃ relative density 2.18(16 ℃) solubility slightly soluble in ethanol. Soluble in water, its aqueous solution is strongly alkaline. |
Barium hydroxide - Risk and Safety
| Risk Codes | R36/37/38 - Irritating to eyes, respiratory system and skin. R34 - Causes burns R20/22 - Harmful by inhalation and if swallowed. R36/38 - Irritating to eyes and skin. R41 - Risk of serious damage to eyes R35 - Causes severe burns R22 - Harmful if swallowed |
| 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.) S36/37 - Wear suitable protective clothing and gloves. |
| UN IDs | UN 3262 8/PG 2 |
| WGK Germany | 1 |
| RTECS | CQ9200000 |
| TSCA | Yes |
| Hazard Class | 8 |
| Packing Group | III |
| Toxicity | LD50 ipr-mus: 255 mg/kg GTPZAB 28(6),45,84 |
Barium hydroxide - Security information
| dangerous goods mark | C |
| hazard category code | 20/22-34 |
| safety instructions | 26-36/37/39-45 |
| dangerous goods transport number | UN 3262 8/PG 2 |
| WGK Germany | 1 |
| F | 9-34 |
Last Update：2024-04-10 22:29:15
Barium hydroxide - Reference Information
| NIST chemical information | information provided by: webbook.nist.gov (external link) |
| EPA chemical substance information | information provided by: ofmpeb.epa.gov (external link) |
| Strong Base | barium hydroxide is a strong base, chemical formula Ba(OH)2, White amorphous powder solid, toxic! It is easy to absorb carbon dioxide in the air to generate barium carbonate, the relative density is 4.50, the melting temperature is 350, and the decomposition is above 600. Soluble in water, difficult to dissolve in ethanol, ether and acetone. The Crystal precipitated in aqueous solution is Ba(OH)2 · 8H2O, which is a colorless monoclinic crystal with a relative density of 2.18 (16 ℃) and a melting point of 78 ℃, all water of crystallization was lost at 780 °c. barium hydroxide can be prepared by the interaction of barium chloride with sodium hydroxide. The reaction formula is as follows: BaCl2 + 2NaOH → Ba(OH)2 + 2NaCl Industrial barium hydroxide [Ba(OH)2 · 8H2O] content: Grade 1 ≥ 98%, grade 2 ≥ 96%. barium hydroxide is mainly used for petroleum industry additives and refined animal and vegetable oils, also used for the manufacture of barium salt, hardener of synthetic rubber, exclusion of boiler scale, glass composition, softening of water and medicine, plastics, glass, enamel and other industries. Barium hydroxide can also be used as a standard base for quantitative analysis, determination of carbon dioxide content, etc. barium hydroxide should be sealed and stored in a dry warehouse, and can not be stored and mixed with the acid items. |
| solubility in water (g/100ml) | grams dissolved per 100ml of water at different temperatures (℃): 1.67g/0 ℃;2.48g/10 ℃;3.89g/20 ℃;5.59g/30 ℃;8.22g/40 ℃; 20.9g/60 ℃;101g/80 ℃ |
| Use | is used as an analytical reagent, and also used to separate and precipitate sulfate and make barium salt |
| production method | in the boiling state of concentrated aqueous sodium hydroxide solution, pure barium nitrate powder is added according to calculated amount, it was dissolved and filtered while hot. After cooling, most of the crystals of Ba(OH)2 · 8H2O were precipitated. Purification can be performed by Repeated recrystallization. Barium hydroxide octahydrate can be converted into anhydrous barium hydroxide by heating to 550 °c. |
| category | toxic substances |
| toxicity grade | high toxicity |
| Acute toxicity | intraperitoneal-mouse LD50: 255 mg/kg |
| flammability hazard characteristics | non-combustible |
| storage and transportation characteristics | warehouse ventilation and low temperature drying; With acids, metal activities, food, separate storage and transportation of chlorinated rubber |
| extinguishing agent | water, sand |
| toxic substance data | information provided by: pubchem.ncbi.nlm.nih.gov (external link) |
Last Update：2024-04-10 22:29:15
Barium hydroxide - Nature
| melting point | 78 °C(lit.) |
| density | 2.18 g/mL at 25 °C(lit.) |
| morphology | crystalline |
| Ksp precipitation equilibrium constant | pKsp: 3.59 |
Last Update：2024-04-10 22:29:15
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