Difference between revisions of "Iodic acid"

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{{Chembox
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| Name =
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| IUPACName = iodic acid
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| OtherNames =
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| Section1 = {{Chembox Identifiers
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|  CASNo = 7782-68-5
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|  EINECS = 231-962-1
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|  ChemSpiderID = 22761
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|  InChI = InChI=1S/HIO3/c2-1(3)4/h(H,2,3,4)
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  }}
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| Section2 = {{Chembox Properties
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|  Reference = <ref name="G&E">{{Greenwood&Earnshaw1st|page=1010}}.</ref>
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|  Formula = HIO<sub>3</sub>
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|  MolarMass = 175.91 g mol<sup>−1</sup>
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|  Appearance = white crystals
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|  Density =
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|  MeltingPt = 100 °C ''decomp.''
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|  Solubility =
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|  SolubleOther =
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|  Solvent =
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|  pKa = 0.804
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  }}
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| Section3 = {{Chembox Structure
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|  Reference = <ref name="G&E"/>
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|  CrystalStruct =
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|  Coordination =
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|  MolShape = pyramidal; ''r''(I=O) = 181&nbsp;pm, ''r''(I–OH) = 189&nbsp;pm, O=I=O = 101.4°, O=I–OH = 97°
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  }}
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| Section7 = {{Chembox Hazards
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|  ExternalMSDS =
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|  EUIndex = not listed
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|  FlashPt = non-flammable
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  }}
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| Section8 = {{Chembox Related
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|  OtherAnions = [[Hydriodic acid]]<br/>[[Periodic acid]]
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|  OtherCpds = [[Chloric acid]]<br/>[[Bromic acid]]
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  }}
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'''Iodic acid''', HIO<sub>3</sub>, is a moderately strong [[oxoacid]] of [[iodine]]. It forms a series of salts called [[iodate]]s.
 
'''Iodic acid''', HIO<sub>3</sub>, is a moderately strong [[oxoacid]] of [[iodine]]. It forms a series of salts called [[iodate]]s.
  
Iodic acid may be prepared by the oxidation of suspensions of iodine in water, either by [[electrolysis]] or with [[nitric acid]].<ref name="G&E">{{Greenwood&Earnshaw1st|page=1010}}.</ref> Unlike [[Chloric acid|chloric]] and [[bromic acid]]s, it can be isolated as a white crystalline air-stable solid. The solid decomposes on heating, first to HIO<sub>3</sub>·I<sub>2</sub>O<sub>5</sub> at about 100&nbsp;°C, then to [[iodine pentoxide]] at about 200&nbsp;°C.
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Iodic acid may be prepared by the oxidation of suspensions of iodine in water, either by [[electrolysis]] or with [[nitric acid]].<ref name="G&E"/> Unlike [[Chloric acid|chloric]] and [[bromic acid]]s, it can be isolated as a white crystalline air-stable solid. The solid decomposes on heating, first to HIO<sub>3</sub>·I<sub>2</sub>O<sub>5</sub> at about 100&nbsp;°C, then to [[iodine pentoxide]] at about 200&nbsp;°C.<ref name="G&E"/>
  
 
==Notes and references==
 
==Notes and references==

Revision as of 09:17, 10 September 2010

IUPAC name iodic acid
Identifiers
InChI InChI=InChI=1S/HIO3/c2-1(3)4/h(H,2,3,4)
CAS number [7782-68-5]
EC number 231-962-1
ChemSpider 22761
Properties[1]
Chemical formula HIO3
Molar mass 175.91 g mol−1
Appearance white crystals
Melting point

100 °C decomp.

Acidity (pKa) 0.804
Structure[1]
Molecular geometry pyramidal; r(I=O) = 181 pm, r(I–OH) = 189 pm, O=I=O = 101.4°, O=I–OH = 97°
Hazards
EU index number not listed
Flash point non-flammable
Related compounds
Other anions Hydriodic acid
Periodic acid
Other compounds Chloric acid
Bromic acid
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)

Iodic acid, HIO3, is a moderately strong oxoacid of iodine. It forms a series of salts called iodates.

Iodic acid may be prepared by the oxidation of suspensions of iodine in water, either by electrolysis or with nitric acid.[1] Unlike chloric and bromic acids, it can be isolated as a white crystalline air-stable solid. The solid decomposes on heating, first to HIO3·I2O5 at about 100 °C, then to iodine pentoxide at about 200 °C.[1]

Notes and references

Notes

References

  1. 1.0 1.1 1.2 1.3 Greenwood, Norman N.; Earnshaw, A. Chemistry of the Elements; Pergamon: Oxford, 1984; p 1010. ISBN 0-08-022057-6.

External links

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