Sodium bismuthate
| Sodium bismuthate | |
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Other names
Sodium bismuth oxide |
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| Identifiers | |
| CAS number | 12232-99-4  = |
| EC number | 235-455-6 |
| Jmol-3D images | Image 1 |
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| Properties | |
| Molecular formula | NaBiO3 |
| Molar mass | 279.97 g/mol |
| Appearance | Light brown powder |
| Density | 6.50 g/cm3 |
| Solubility in water | insoluble in cold, decomp. in hot water |
| Hazards | |
| EU classification | Harmful (Xn) |
| R-phrases | R22, R36/37/38 |
| S-phrases | S26, S36 |
| LD50 | 420 mg/kg (rat) |
 (verify) (what is:  / ?)Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) |
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| Infobox references | |
Sodium bismuthate is the inorganic compound with the formula NaBiO3. It is a yellowish solid that is a strong oxidiser.[1] It is not soluble in cold water. It is one of the few sodium salts that is insoluble in water.
Structure[edit]
Sodium bismuthate adopts a perovskite structure, consisting of octahedral Bi5+ centers with the Na+ centers occupying the cubic sites. The average Bi-O distance is 2.116 Å.[2]
Synthesis and reactions[edit]
Bismuth oxidizes to Bi(V) only with difficulty in the absence of alkali. For example, the simple oxide Bi2O5 remains poorly characterized. The preparation of this salt involves oxidizing a mixture of Bi2O3 and Na2O with air (source of O2):[3]
- Na2O + O2 + Bi2O3 → 2 NaBiO3
The procedure is analogous to the preparation oxidation of manganese dioxide in alkali to give sodium manganate.
It oxidizes water, decomposing into bismuth(III) oxide and sodium hydroxide:
- 4 NaBiO3 + 2 H2O → 4 NaOH + 2 Bi2O3 + 3 O2
It is decomposed more rapidly by acids.
As a strong oxidizer, sodium bismuthate converts virtually any manganese compound to permanganate, which is easily assayed spectrophotometrically.[3] It is also used for lab-scale separation of plutonium.
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Vial of NaBiO3.
References[edit]
- ^ "Sodium bismuthate". Mallinckrodt Baker. 06/19/07.
- ^ N. Kumada, N. Kinomura, A.W. Sleight "Neutron powder diffraction refinement of ilmenite-type bismuth oxides: ABiO3 (A = Na, Ag)" Materials Research Bulletin 2000, volume 35, pp. 2397–2402. doi:10.1016/S0025-5408(00)00453-0
- ^ a b Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth–Heinemann. ISBN 0080379419.
