Ammonium iodate
Names | |
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IUPAC name Ammonium iodate | |
Other names Iodic acid, ammonium salt | |
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ECHA InfoCard | 100.033.252 |
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InChI
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Properties | |
Chemical formula | NH4IO3 |
Molar mass | 192.94 g/mol |
Appearance | white crystalline powder |
Density | 3.309 g/cm3 |
Melting point | decomposes at 150 °C |
Solubility in water | 29.883 g/L (25 °C) [1] |
Magnetic susceptibility (χ) | -62.3·10−6 cm3/mol |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references |
Ammonium iodate is an inorganic salt which is sparingly soluble in cold, and moderately soluble in hot water, like all iodate salts, it is a strong oxidizer.
Preparation
Ammonium iodate can be obtained by neutralising a solution of iodic acid with ammonia.[2]
- HIO3 + NH3 → NH4IO3
Using its low solubility in water, it can also be precipitated from an iodate solution with an ammonium salt.
- 2 KIO3 + (NH4)2SO4 → 2 NH4IO3 + K2SO4
Unlike other iodates, ammonium iodate can't be prepared by dissolving iodine in an ammonium hydroxide solution, instead the highly explosive nitrogen triiodide is formed.
- 3 I2 + 5 NH3 → 3 NH4I + NH3·NI3
Chemical properties
Because ammonium iodate consists of the reducing ammonium ion and the oxidizing iodate ion, it already starts to decompose at 150 °C into nitrogen, oxygen, iodine and water.
- NH4IO3 → 1/2N2 + 1/2O2 + 1/2I2 + 2H2O
Below 60 °C this reaction cannot sustain itself, but with catalysts like potassium dichromate or copper(II) chloride it can also combust at room temperature.[2]
Safety
Like all iodates, ammonium iodate is a strong oxidizer and should therefore be kept away from flammable materials like sulfur, phosphorus and metals powders [3]
References
- ^ "Eigenschaften von Ammoniumiodat - Das Periodensystem online".
- ^ a b "Combustion of the Inorganic Salts Ammonium Iodate And Hydroxylamine Sulfate" (PDF). Archived from the original (PDF) on 2016-10-28. Retrieved 2016-10-28.
- ^ "Safety Data Sheet Ammonium iodate" (PDF). Alpha Aesar. 1 June 2012. Archived from the original (PDF) on 2016-10-29. Retrieved 2016-10-28.
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monatomic anions |
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oxyanions |
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other anions |
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- Aluminon
- Ammonium acetate
- Ammonium adipate
- Ammonium benzoate
- Ammonium bituminosulfonate
- Ammonium carbamate
- Ammonium citrate
- Ammonium diethyl dithiophosphate
- Ammonium ferric citrate
- Ammonium formate
- Ammonium fumarate
- Ammonium glutamate
- Ammonium lactate
- Ammonium lauryl sulfate
- Ammonium malate
- Ammonium nonanoate
- Ammonium oxalate
- Ammonium picrate
- Ammonium perfluorononanoate
- Ammonium propionate
- Ammonium thioglycolate
- Cupferron
- Ferric ammonium oxalate
- Murexide