Sodium bismuthate

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Sodium bismuthate
Sodium bismuthate, chemical formule.png
Idealized chemical formula of sodium bismuthate
Kristallstruktur Perovskit.png
Solid state structure
Names
Other names
Sodium bismuth oxide
Identifiers
12232-99-4 N
EC Number 235-455-6
Jmol 3D model Interactive image
  • InChI=1S/Bi.Na.3O/q;+1;;;-1
  • [O-][Bi](=O)=O.[Na+]
Properties
NaBiO3
Molar mass 279.97 g/mol
Appearance Light brown powder
Density 6.50 g/cm3
insoluble in cold, decomposes in hot water
Vapor pressure {{{value}}}
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 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. It is commercially available however commercial samples may be a mixture of bismuth(V) oxide, sodium carbonate and sodium peroxide.[2]

Structure

Sodium bismuthate adopts an ilmenite structure, consisting of octahedral Bi5+ centers and Na+ centers. The average Bi-O distance is 2.116 Å. The ilmenite structure is related to the corundum structure (Al2O3) with a layer structure formed by close packed oxygen atoms with the two different cations, Na+ and Bi5+ alternating in octahedral sites.[3]

Synthesis and reactions

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):[4]

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:

2 NaBiO3 + H2O → 2 NaOH + Bi2O3 + 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.[4] It is also used for lab-scale separation of plutonium.

Vial of NaBiO3.

References

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  3. Lua error in package.lua at line 80: module 'strict' not found. – via ScienceDirect (Subscription may be required or content may be available in libraries.)
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