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Bismuth(III) carbonate dioxide : (bismuthyl carbonate; Bi2O2CO3) A white solid prepared by mixing solutions of bismuth nitrate and ammonium carbonate. It contains the (BiO)+ ion.
Bismuth(III) chloride (bismuth trichloride; BiCl3) A white deliquescent solid. It can be prepared by direct combination of bismuth and chlorine. Bismuth(III) chloride dissolves in excess dilute hydrochloric acid to form a clear liquid, but if diluted it produces a white precipitate of bismuth(III) chloride oxide (bismuthyl chloride, BiOCl):
BiCl3 + H2O → BiOCl + 2HCl
This reaction is often used as an example of a reversible reaction and as a confirmatory test for bismuth during quantitative analysis. Bismuth(V) chloride does not form.
Bismuth(III) nitrate oxide (bismuthyl nitrate; BiONO3) A white insoluble solid, often referred to as bismuth subnitrate. It is precipitated when bismuth(III) nitrate is diluted and contains the (BiO)+ ion. Bismuth( III) nitrate oxide is used in pharmaceutical preparations.