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Uranyl acetate

Uranyl acetate

IUPAC name	Uranium bis(acetato)-O)dioxo-dihydrate
Other names	Uranium acetate
Identifiers
CAS number	[541-09-3]
Properties
Molecular formula	(UO₂(CH₃COO)₂·2H₂O)
Molar mass	424.15
Solubility in other solvents	7.694g/100g_H₂O
Hazards
MSDS	External MSDS
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references

Uranyl acetate (UO₂(CH₃COO)₂·2H₂O) is a yellow free-flowing crystalline solid of yellow rhombic crystals with a slight acetic odor.

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It is used as a negative stain in electron microscopy. In fact, most procedures in electron microscopy for biology require the use of uranyl acetate. 1% and 2% uranyl acetate solutions are used as an indicator, and a titrant in stronger concentrations in analytical chemistry, as it forms an insoluble salt with sodium (the vast majority of sodium salts are water-soluble). Uranyl acetate solutions show evidence of being sensitive to light, especially UV and will precipitate if exposed.

Commercial preparations of uranyl acetate are made from depleted uranium and have a typical radioactivity of 0.37 - 0.51 µCi/g. This mild radioactivity level is not sufficient to be harmful while the material remains external to the body. However it is very toxic by ingestion and if inhaled as dust or by skin contact if skin is cut or abraded and there is a danger of cumulative effects from long term exposure.