Difference between revisions of "Potassium biiodate"
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'''Potassium biiodate''', KH(IO<sub>3</sub>)<sub>2</sub>, is a [[primary standard]] [[strong acid]] in [[analytical chemistry]].<ref>{{citation | title = The Use of Potassium Bi-iodate as a Standard Substance in Alkalimetric and Iodimetric Titrations | first1 = I. M. | last1 = Kolthoff | first2 = L. H. | last2 = van Berk | journal = J. Am. Chem. Soc. | year = 1926 | volume = 48 | issue = 11 | pages = 2799–2801 | doi = 10.1021/ja01690a006}}.</ref><ref>{{citation | title = Processing KODAK Motion Picture Films, Module 4 – Potassium Biiodate | url = http://motion.kodak.com/motion/uploadedFiles/US_plugins_acrobat_en_motion_support_processing_h244_potBiiod.pdf | publisher = Kodak | accessdate = 2010-09-09}}.</ref> | '''Potassium biiodate''', KH(IO<sub>3</sub>)<sub>2</sub>, is a [[primary standard]] [[strong acid]] in [[analytical chemistry]].<ref>{{citation | title = The Use of Potassium Bi-iodate as a Standard Substance in Alkalimetric and Iodimetric Titrations | first1 = I. M. | last1 = Kolthoff | first2 = L. H. | last2 = van Berk | journal = J. Am. Chem. Soc. | year = 1926 | volume = 48 | issue = 11 | pages = 2799–2801 | doi = 10.1021/ja01690a006}}.</ref><ref>{{citation | title = Processing KODAK Motion Picture Films, Module 4 – Potassium Biiodate | url = http://motion.kodak.com/motion/uploadedFiles/US_plugins_acrobat_en_motion_support_processing_h244_potBiiod.pdf | publisher = Kodak | accessdate = 2010-09-09}}.</ref> | ||
| + | |||
| + | ==Chemistry== | ||
| + | The biiodate anion is a [[Hydrogen bond|hydrogen-bonded]] species formed from the reaction of an [[iodate]] anion with undissociated [[iodic acid]].<ref>{{Greenwood&Earnshaw1st|page=1010}}.</ref> | ||
| + | :IO{{su|b=3|p=−}} + HIO<sub>3</sub> → [H(IO<sub>3</sub>)<sub>2</sub>]<sup>−</sup> ''K''<sub>c</sub> ≈ 4 dm<sup>3</sup> mol<sup>−1</sup> | ||
| + | |||
| + | ==Ferroelectricity== | ||
| + | Potassium biiodate forms a [[Ferroelectricity|ferroelectric]] phase below the [[Curie point]] of ''T''<sub>C</sub> = 223(2) K.<ref>{{citation | title = Ferroelectric phase transition in potassium Bi-iodate | first1 = A. M. | last1 = Petrosyana | first2 = A. A. | last2 = Buscha | first3 = V. V. | last3 = Chechkina | first4 = A. F. | last4 = Volkova | first5 = Yu. N. | last5 = Venevtsev | doi = 10.1080/00150197808237316 | journal = Ferroelectrics | volume = 21 | issue = 1 | year = 1978 | pages = 525–26}}.</ref> The [[second-order phase transition]] appears to be associated with the ordering of the hydrogen bonds in the crystal structure.<ref>{{citation | first1 = A. | last1 = Barabash | first2 = J. | last2 = Baran | first3 = T. | last3 = Gavrilko | first4 = K. | last4 = Eshimov | first5 = G. | last5 = Puchkovskaya | first6 = H. | last6 = Ratajczak | title = Structure and dynamics of crystal α-modification of potassium biiodate | journal = J. Mol. Struct. | volume = 404 | issue = 1–2 | year = 1997 | pages = 187–91 | doi = 10.1016/S0022-2860(96)09380-5}}.</ref> | ||
==Notes and references== | ==Notes and references== | ||
Revision as of 19:43, 9 September 2010
| Potassium biiodate | |
|---|---|
| IUPAC name | potassium µ-hydridobis(trioxidoiodate)(1−) |
| Other names | potassium hydrogen iodate |
| Identifiers | |
| InChI | InChI=1/2HIO3.K/c2*2-1(3)4;/h2*(H,2,3,4);/q;;+1/p-1 |
| InChIKey | ACAYDTMSDROWHW-REWHXWOFAC |
| Standard InChI | InChI=1S/2HIO3.K/c2*2-1(3)4;/h2*(H,2,3,4);/q;;+1/p-1 |
| Standard InChIKey | ACAYDTMSDROWHW-UHFFFAOYSA-M |
| CAS number | [] |
| EC number | |
| ChemSpider | |
| Properties[1] | |
| Chemical formula | KH(IO3)2 |
| Molar mass | 389.91 g mol−1 |
| Appearance | white crystals |
| Solubility in water | 1.33 g/100 ml (15 °C) |
| Hazards[2][3][Note 1] | |
| EU index number | not listed |
| GHS pictograms |   
|
| GHS signal word | DANGER |
| GHS hazard statements | H272, H302, H314, H318 |
| GHS precautionary statements | P210, P220, P221, P260, P264, P270, P280, P301+312, P301+330+331, P303+361+353, P363, P304+340, P310, P321 |
| Flash point | Non-flammable |
| Related compounds | |
| Other compounds | Potassium iodate Iodic acid |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) | |
Potassium biiodate, KH(IO3)2, is a primary standard strong acid in analytical chemistry.[4][5]
Chemistry
The biiodate anion is a hydrogen-bonded species formed from the reaction of an iodate anion with undissociated iodic acid.[6]
- IO−3 + HIO3 → [H(IO3)2]− Kc ≈ 4 dm3 mol−1
Ferroelectricity
Potassium biiodate forms a ferroelectric phase below the Curie point of TC = 223(2) K.[7] The second-order phase transition appears to be associated with the ordering of the hydrogen bonds in the crystal structure.[8]
Notes and references
Notes
- ↑ Hazards were assessed as for an equimolar mixture of potassium iodate and iodic acid.
References
- ↑ CRC Handbook of Chemistry and Physics, 62nd ed.; Weast, Robert C., Ed.; CRC Press: Boca Raton, FL, 1981; p B-133. ISBN 0-8493-0462-8.
- ↑ HSNO Chemical Classification Information Database, <http://www.ermanz.govt.nz/Chemicals/ChemicalDisplay.aspx?SubstanceID=1913> (accessed 9 September 2010), New Zealand Environmental Risk Management Authority. (potassium iodate)
- ↑ 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. (iodic acid)
- ↑ Kolthoff, I. M.; van Berk, L. H. The Use of Potassium Bi-iodate as a Standard Substance in Alkalimetric and Iodimetric Titrations. J. Am. Chem. Soc. 1926, 48 (11), 2799–2801. DOI: 10.1021/ja01690a006.
- ↑ Processing KODAK Motion Picture Films, Module 4 – Potassium Biiodate; Kodak, <http://motion.kodak.com/motion/uploadedFiles/US_plugins_acrobat_en_motion_support_processing_h244_potBiiod.pdf>. (accessed 9 September 2010).
- ↑ Greenwood, Norman N.; Earnshaw, A. Chemistry of the Elements; Pergamon: Oxford, 1984; p 1010. ISBN 0-08-022057-6.
- ↑ Petrosyana, A. M.; Buscha, A. A.; Chechkina, V. V.; Volkova, A. F.; Venevtsev, Yu. N. Ferroelectric phase transition in potassium Bi-iodate. Ferroelectrics 1978, 21 (1), 525–26. DOI: 10.1080/00150197808237316.
- ↑ Barabash, A.; Baran, J.; Gavrilko, T.; Eshimov, K.; Puchkovskaya, G.; Ratajczak, H. Structure and dynamics of crystal α-modification of potassium biiodate. J. Mol. Struct. 1997, 404 (1–2), 187–91. DOI: 10.1016/S0022-2860(96)09380-5.
