Holmium iodate

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| CASNo = 23340-47-8

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| CASNo_Comment = anhydrous

| CASNo2 = 24859-42-5

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| CASNo2_Comment = tetrahydrate

| ChemSpiderID = 20082500

| PubChem = 21149397

| InChI=1S/Ho.3HIO3/c;3*2-1(3)4/h;3*(H,2,3,4)/q+3;;;/p-3

| InChIKey = RZAVVMZWGQFLIE-UHFFFAOYSA-K

| EC_number = 245-593-9

| SMILES = [O-]I(=O)=O.[O-]I(=O)=O.[O-]I(=O)=O.[Ho+3] }}

| Section2 = {{Chembox Properties

| Formula = Ho(IO₃)₃

| MolarMass = 689.64

| Appearance = pink solid

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Holmium iodate is an inorganic compound with the chemical formula Ho(IO₃)₃. It can be obtained by reacting holmium periodate and periodic acid in water at 170 °C.{{Cite journal |last=Douglas |first=Paul |last2=Hector |first2=Andrew L. |last3=Levason |first3=William |last4=Light |first4=Mark E. |last5=Matthews |first5=Melissa L. |last6=Webster |first6=Michael |date=Mar 2004 |title=Hydrothermal Synthesis of Rare Earth Iodates from the Corresponding Periodates: II 1) . Synthesis and Structures of Ln(IO 3 ) 3 (Ln = Pr, Nd, Sm, Eu, Gd, Tb, Ho, Er) and Ln(IO 3 ) 3 · 2H 2 O (Ln = Eu, Gd, Dy, Er, Tm, Yb) |url=https://onlinelibrary.wiley.com/doi/10.1002/zaac.200300377 |journal=Zeitschrift für anorganische und allgemeine Chemie |language=en |volume=630 |issue=3 |pages=479–483 |doi=10.1002/zaac.200300377 |issn=0044-2313|url-access=subscription }} Its solubility in water is 1.162±0.001 (25 °C, 103 mol·dm⁻³). Adding ethanol or methanol to water will reduce the solubility.{{Cite journal |last=Miyamoto |first=Hiroshi |last2=Shimura |first2=Hiroko |last3=Sasaki |first3=Kayoko |date=Jul 1985 |title=Solubilities of rare earth lodates in aqueous and aqueous alcoholic solvent mixtures |url=http://link.springer.com/10.1007/BF00646980 |journal=Journal of Solution Chemistry |language=en |volume=14 |issue=7 |pages=485–497 |doi=10.1007/BF00646980 |issn=0095-9782|url-access=subscription }}