Difference between revisions of "Iodic acid"

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| IUPACName = iodic acid
 
| IUPACName = iodic acid
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| Section1 = {{Chembox Identifiers
 
|  CASNo = 7782-68-5
 
|  CASNo = 7782-68-5
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|  ChemSpiderID = 22761
 
|  ChemSpiderID = 22761
 
|  InChI = InChI=1S/HIO3/c2-1(3)4/h(H,2,3,4)
 
|  InChI = InChI=1S/HIO3/c2-1(3)4/h(H,2,3,4)
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|  StdInChI=1S/HIO3/c2-1(3)4/h(H,2,3,4)
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|  InChIKey = ICIWUVCWSCSTAQ-UHFFFAOYAT
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|  StdInChIKey = ICIWUVCWSCSTAQ-UHFFFAOYSA-N
 
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|  Reference = <ref>{{GHS class NZ|id=12620|accessdate=2010-09-09}}.</ref>
 
|  ExternalMSDS =  
 
|  ExternalMSDS =  
 
|  EUIndex = not listed
 
|  EUIndex = not listed
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|  GHSPictograms = {{GHS03|Ox. Sol. 2}}{{GHS05|Skin Corr. 1C, Eye Dam. 1}}
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|  GHSSignalWord = DANGER
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|  HPhrases = {{H-phrases|272|314|318}}
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|  PPhrases = {{P-phrases|210|220|221|260|264|280| 301+330+331|303+361+353|363|304+340|310|321|305+351+338|370+378|405|501}}
 
|  FlashPt = non-flammable
 
|  FlashPt = non-flammable
 
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Revision as of 09:24, 10 September 2010

Iodic acid
IUPAC name iodic acid
Identifiers
InChI InChI=InChI=1S/HIO3/c2-1(3)4/h(H,2,3,4)
InChIKey ICIWUVCWSCSTAQ-UHFFFAOYAT
Standard InChI InChI=1S/HIO3/c2-1(3)4/h(H,2,3,4)
Standard InChIKey ICIWUVCWSCSTAQ-UHFFFAOYSA-N
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[2]
EU index number not listed
GHS pictograms Ox. Sol. 2Skin Corr. 1C, Eye Dam. 1
GHS signal word DANGER
GHS hazard statements H272, H314, H318
GHS precautionary statements P210, P220, P221, P260, P264, P280, P301+330+331, P303+361+353, P363, P304+340, P310, P321, P305+351+338, P370+378
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.
  2. HSNO Chemical Classification Information Database, <http://www.ermanz.govt.nz/Chemicals/ChemicalDisplay.aspx?SubstanceID=12620> (accessed 9 September 2010), New Zealand Environmental Risk Management Authority.

External links

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