Barium selenate , 99.9 , 7787-41-9
CAS NO.：7787-41-9
Empirical Formula: BaH4O4Se
Molecular Weight: 284.33
MDL number: MFCD00046181
EINECS: 232-113-8
PRODUCT Properties
| Melting point: | >350 °C(lit.) |
| Density | 4.750 |
| form | white rhombohedral crystals |
| color | white rhomb crystals, crystalline |
| Water Solubility | g/L soln; H2O; 0.081 (25°C); soluble HCl, insoluble HNO3 [MER06] [KRU93] |
| Solubility Product Constant (Ksp) | pKsp: 7.47 |
| Exposure limits | ACGIH: TWA 0.5 mg/m3; TWA 0.2 mg/m3 NIOSH: IDLH 50 mg/m3; IDLH 1 mg/m3; TWA 0.5 mg/m3; TWA 0.2 mg/m3 |
| CAS DataBase Reference | 7787-41-9 |
| EPA Substance Registry System | Selenic acid, barium salt (1:1) (7787-41-9) |
Description and Uses
Barium selanate has the molecular formula of BaSeO4
and the molecular weight of 280.2748 g/mol. It can be
prepared by reacting sodium selenate with barium chloride
in solution:
BaCl2(aq)+ Na2SeO4(aq) ? BaSeO4+ 2NaCl(aq)
Barium selenate is slightly soluble in water at
0.0052 g/100 ml at 20°C. Its CAS number is 7787-41-9.
It is a white rhombic crystal which decomposes when
heated beyond about 425°C. It is slightly soluble in
water at 0.0152 g/100 ml at 20°C. Its solubility product
is 3.40×10-8.
The heat of formation of barium selenate is:
△H298 BaSeO4 = -249.0 kcal/mol (-1041.8 kJ/mol).
As a result of the measurements, it has been found
that for the reaction:
Basolid+ Sesolid+ 2O2 = BaSeO4
△H298 = -279.2 cal/mol
△F298 = -249.1 cal/mol
Safety
| Symbol(GHS) |    GHS06,GHS08,GHS09 |
| Hazard statements | H301-H331-H373-H400-H410 |
| Precautionary statements | P260-P301+P310a-P304+P340-P311a-P405-P501a |
| Hazard Codes | T,N |
| Risk Statements | 23/25-33-50/53 |
| Safety Statements | 20/21-28-45-60-61 |
| RIDADR | UN 2630 6.1/PG 1 |
| WGK Germany | 2 |
| TSCA | Yes |
| HazardClass | 6.1(a) |
| PackingGroup | II |
| HS Code | 28419000 |
