Bismuth Subnitrate CAS 1304-85-4

1. Description

Bismuth Subnitrate (CAS 1304-85-4) is a high-purity inorganic bismuth salt widely utilized in the pharmaceutical industry as an active pharmaceutical ingredient (API) or excipient. Primarily known for its astringent, antacid, and protective properties, it features in topical preparations like ointments and dusting powders for skin conditions. It also serves historically in oral formulations for managing gastrointestinal discomfort and providing mucosal protection.

2. Properties Table

Property Value

Chemical Name Bismuth Subnitrate (Bismuth(III) nitrate basic)

CAS Number 1304-85-4

Chemical Formula $B i_{5} O (O H)_{9} (N O_{3})_{4}$ (approximate, composition can vary slightly)

Molecular Weight approx. $1461.98 g/mol$

Appearance White to slightly yellowish, heavy, odorless microcrystalline powder

Purity (Assay) > 98.0%

Solubility Practically insoluble in water and alcohol; Soluble in dilute mineral acids

Melting Point Decomposes upon heating (approx. $26 0^{\circ} C$ )

Regulatory Status Compliant with major pharmacopeias (e.g., USP, BP) when specified

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