Holmium acetate

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  Holmium acetate   
Names: holmium(III) acetate
holmium tricetate

Formula: Ho(CH3COO)3 (anhydrous)
Ho(CH3COO)3 · 4H2O (tetrahydrate)
SMILES: CC(=O)[O-].CC(=O)[O-].CC(=O)[O-].[Ho+3]
Molar mass: 342.061 g/mol (anhydrous)
414.121 g/mol (tetrahydrate)
Crystal system: triclinic (tetrahydrate)

Color: pale-yellow
Decomposition point: 327 °C
600.15 K
620.6 °F
1,080.27 °R
Magnetic properties: paramagnetic
Stability: stable (tetrahydrate)
Hardness: fragile
Toxicity: moderately toxic


Organic compound, salt of trivalent rare earth metal holmium and organic acetic acid. From water solutions crystallizes as tetrahydrate.


Reaction between holmium (III) oxide, hydroxide or carbonate and acetic acid

Chemical equation:

6CH3COOH + Ho2O3 = 2Ho(CH3COO)3 + 3H2O
3CH3COOH + Ho(OH)3 = Ho(CH3COO)2 + 3H2O
6CH3COOH + Ho2(CO3)3 = 2Ho(CH3COO)3 + 3H2O + 3CO2

For preparation of 100.00g of holmium acetate tetrahydrate а 61.56g of holmium carbonate or 52.15g of hydroxide or 45.62g of oxide and 62.15g of 70% acetic acid is required.
Add acid to the flask, then add small parts of holmium compound with stirring until it will totally dissolve or, if you use carbonate, until carbon dioxide emission will stop. After reaction will stop, filter the solution and use it for crystal growing.

Storage conditions

Store in its original form or under several layers of varnish at average humidity and room temperature. Do not store in matchboxes or cotton wool and do not heat.


Soluble in water.