Ammonium iodate

Ammonium iodate
Names
	IUPAC name Ammonium iodate
	Other names Iodic acid, ammonium salt
Identifiers
CAS Number	13446-09-8;
3D model (JSmol)	Interactive image;
ChemSpider	145937;
ECHA InfoCard	100.033.252
PubChem CID	166805;
CompTox Dashboard (EPA)	DTXSID60928630 ;
	InChI InChI=1S/HIO3.H3N/c2-1(3)4;/h(H,2,3,4);1H3 Key: ZRDJERPXCFOFCP-UHFFFAOYSA-N;
	SMILES [NH4+].[O-]I(=O)=O;
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)
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.

Ammonium Iodate

Preparation[]

Ammonium iodate can be obtained by neutralising a solution of iodic acid with ammonia.^[2]

HIO 3 + NH 3 \to NH 4 IO 3

Using its low solubility in water, it can also be precipitated from an iodate solution with an ammonium salt.

2 KIO 3 + (NH 4) 2 SO 4 \to 2 NH 4 IO 3 + K 2 SO 4

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 I 2 + 5 NH 3 \to 3 NH 4 I + NH 3 *NI 3

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.

NH 4 IO 3 \to ½ N 2 + ½ O 2 + ½I 2 + 2 H 2 O

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[]

[1] "Eigenschaften von Ammoniumiodat - Das Periodensystem online".

[dtic-2] ttp://www.dtic.mil/dtic/tr/fulltext/u2/295766.pdf

[alfa-3] ttps://www.alfa.com/de/content/msds/english/14531.pdf

[1]

[2]

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