Barium hydroxide , Waterless, 94-98 , 17194-00-2
Synonym(s):
Barium dihydroxide
CAS NO.：17194-00-2
Empirical Formula: BaH2O2
Molecular Weight: 171.34
MDL number: MFCD00003443
EINECS: 241-234-5
PRODUCT Properties
| Melting point: | >300 °C(lit.) |
| Boiling point: | decomposes at 1032 (calculated) [KNA91] |
| Density | 2.2 g/mL at 25 °C(lit.) |
| solubility | Aqueous Acid (Slightly), Water (Slightly) |
| form | Solid |
| color | Clear |
| Odor | no odor |
| PH | 11.27(1 mM solution);12.22(10 mM solution);13.08(100 mM solution) |
| Water Solubility | Soluble in water. |
| Sensitive | Air Sensitive & Hygroscopic |
| Merck | 14,977 |
| Exposure limits | ACGIH: TWA 0.5 mg/m3 NIOSH: IDLH 50 mg/m3; TWA 0.5 mg/m3 |
| Stability: | Stable. Incompatible with acids, carbon dioxide, moisture. |
| InChIKey | RQPZNWPYLFFXCP-UHFFFAOYSA-L |
Description and Uses
Barium Hydroxide occurs as an anhydrate whose prismatic, colorless
crystals are very deliquescent. Barium hydroxide can
be prepared by dissolving barium oxide (BaO) in water:
BaO＋ 9H2O→Ba(OH)2·8H2O
It crystallizes as the octahydrate, which converts to
the monohydrate upon heating in air. Barium oxide
has been found to react with water vapor at temperatures
from 1443 to 1593 K to form gaseous Ba(OH)2
according to the reaction:
BaO(solid)＋H2O(gas)→Ba(OH)2(gas)
A better method of preparation involves addition of
NaOH to the nitrate. Since barium hydroxide is fairly
soluble, it is necessary to evaporate the solution to crystallize Ba(OH)2·8H2O. Ethanol is added to aid in this crystallization. The crystals are washed in cold ethanol to remove sodium ions and then dried.
Carbon dioxide absorbant.
Safety
| Symbol(GHS) |   GHS05,GHS07 |
| Signal word | Danger |
| Hazard statements | H302+H332-H314 |
| Precautionary statements | P260-P280-P301+P312-P303+P361+P353-P304+P340+P310-P305+P351+P338 |
| Hazard Codes | C,Xi,Xn |
| Risk Statements | 36/37/38-34-20/22-36/38-41-35-22 |
| Safety Statements | 26-36/37/39-45-36/37 |
| RIDADR | UN 3262 8/PG 2 |
| WGK Germany | 1 |
| RTECS | CQ9200000 |
| TSCA | Yes |
| HazardClass | 8 |
| PackingGroup | III |
| HS Code | 2805191000 |
| Toxicity | LD50 ipr-mus: 255 mg/kg GTPZAB 28(6),45,84 |
