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Bismuth subcarbonate

Bismuth subcarbonate
Names
Other names
bismuth oxycarbonate, bismuthyl carbonate,
bismutite
Identifiers
ECHA InfoCard 100.025.061
PubChem CID
UNII
Properties
(BiO)2(CO3)
Molar mass 509.9685 g/mol
Appearance fine white to pale yellow-white powder
Density 6.86 g/cm3
Boiling point decomposes
insoluble
Hazards
NFPA 704
Flammability code 0: Will not burn. E.g., water Health code 1: Exposure would cause irritation but only minor residual injury. E.g., turpentine Reactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g., liquid nitrogen Special hazards (white): no codeNFPA 704 four-colored diamond
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

Bismuth subcarbonate (BiO)2CO3, sometimes written Bi2O2(CO3) is a chemical compound of bismuth containing both oxide and carbonate anions. Bismuth is in the +3 oxidation state. Bismuth subcarbonate occurs naturally as the mineral bismutite. Its structure consists of Bi-O layers and CO3 layers and is related to kettnerite, CaBi(CO3)OF. It is light sensitive.

It is highly radiopaque and for example is used as a filler in radiopaque catheters which can be seen by x-ray. In modern medicine, bismuth subcarbonate has been made into nanotube arrays that exhibit antibacterial properties. It is also used in fireworks  to make Dragon's eggs. It is a constituent of milk of bismuth which was a popular digestive tract panacea in the 1930s

Bismuth subcarbonate may be harmful if swallowed. It may irritate the respiratory and gastrointestinal tract.


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