| Identification | More | [Name]
Iodic acid | [CAS]
7782-68-5 | [Synonyms]
HYDROGEN IODATE
IODIC ACID
IODIC (V) ACID
10dicacid
iodic
iodicacid(hio3)
IODIC ACID, ACS
IODIC ACID, 99.99+%
IODIC ACID, 99.5+%, A.C.S. REAGENT
IodicAcidGr99.9%
IODIC ACID GR
Iodicacid,99%
Iodic acid, for analysis ACS, 99.6%
Iodic acid, for analysis, 99.5%
IODIC ACID REAGENT (ACS)
IODICACID,CRYSTAL,REAGENT,ACS
Iodic acid, ACS, 99.5%
Iodic Acid, Crystal, Reagent
IODIC ACID, 99.6%, FOR ANALYSIS ACS
Iodic acid, for analysis | [EINECS(EC#)]
231-962-1 | [Molecular Formula]
HIO3 | [MDL Number]
MFCD00011348 | [Molecular Weight]
175.91 | [MOL File]
7782-68-5.mol |
| Chemical Properties | Back Directory | [Appearance]
white crystals | [Melting point ]
110°C (dec.) | [density ]
4.62 | [form ]
Solid | [pka]
1.28±0.53(Predicted) | [color ]
White to off-white | [Specific Gravity]
4.629 | [Stability:]
Stable. Incompatible with strong reducing agents, alcohols, organic materials. Light-sensitive. | [Water Solubility ]
269 g/100 mL (20 ºC) | [Sensitive ]
Light Sensitive | [Merck ]
14,5012 | [InChIKey]
ICIWUVCWSCSTAQ-UHFFFAOYSA-N | [CAS DataBase Reference]
7782-68-5(CAS DataBase Reference) | [EPA Substance Registry System]
7782-68-5(EPA Substance) |
| Safety Data | Back Directory | [Hazard Codes ]
O,C | [Risk Statements ]
R8:Contact with combustible material may cause fire.
R34:Causes burns. | [Safety Statements ]
S17:Keep away from combustible material .
S26:In case of contact with eyes, rinse immediately with plenty of water and seek medical advice .
S36/37/39:Wear suitable protective clothing, gloves and eye/face protection .
S45:In case of accident or if you feel unwell, seek medical advice immediately (show label where possible) . | [RIDADR ]
UN 3085 5.1/PG 2
| [WGK Germany ]
3
| [F ]
8 | [TSCA ]
Yes | [HazardClass ]
5.1 | [PackingGroup ]
II | [HS Code ]
28111980 |
| Hazard Information | Back Directory | [Hazard]
Toxic by ingestion, strong irritant to eyes
and skin. | [Chemical Properties]
colorless, rhomb crystal(s) or white, crystal(s) powder(s); darkens on exposure to light; it is a moderately strong acid; used in analytical chemistry and in medicine [HAW93] [MER06] | [Definition]
iodic acid: Any of various oxoacids of iodine, such as iodic(V) acid and iodic(VII) acid. When used without an oxidation state specifled, the term usually refers to iodic(V) acid (HIO3). | [General Description]
Iodic acid is the hydrated form of I2O5. Reaction of iodic acid with hydrogen iodide has been described by electrolytic dissociation theory. Combustion of mixture of chromic, iodic, sulfuric and phosphoric acids has been proposed. Its Raman spectra have been recorded. Vibrational assignment of IO3- has been evaluated. | [Purification Methods]
Dissolve iodic acid in the minimum volume of hot dilute HNO3, filter and evaporate in a vacuum desiccator until crystals are formed. Collect the crystals and wash them with a little cold H2O and dry them in air in the dark. It is soluble in H2O: 269g/100mL at 20o and 295g/100mL at 40o. It is soluble in dilute EtOH and darkens on exposure to light. It is converted to HIO3.I2O5 on heating at 70o, but at 220o complete conversion to HIO3 occurs. [Lamb et al. J Am Chem Soc 42 1636 1920, Bray & Caulkins J Am Chem Soc 53 44 1931.] |
| Questions And Answer | Back Directory | [Physical Properties]
White stable crystalline solid; rhombohedral crystals; occurs in two forms: the normal HIO3, and pyroiodic acid HI3O8.
| [Uses]
Aqueous solutions of iodic acid serve as strong oxidizing agents. The acid also is used in redox titrations.
| [Preparation]
Iodic acid may be prepared by the reaction of sulfuric acid with barium iodate. The solution is filtered to remove barium sulfate and then crystallized to obtain iodic acid:
Ba(IO3)2 + H2SO4 → BaSO4 + 2HIO3
It also may be produced by oxidation of iodine with concentrated nitric acid:
3I2 + 10HNO3 → 6HIO3 + 10NO + 2H2O
Also, iodic acid may be obtained by oxidation of iodine with chlorine in dilute acidic solutions:
I2 + 5Cl2 + 6H2O → 2HIO3 + 10HCl
Another method of preparation involves oxidation of iodine with hydrogen peroxide:
I2 + 5H2O2 → 2HIO3 + 4H2O
It also may be prepared by treating hypoiodous acid with a base:
3HIO + 2OH¯ → HIO3 + 2H2O + I¯
Hypoiodous acid may be obtained by alkaline hydrolysis of iodine at pH 12:
I2 + H2O → HIO + H+ + I¯
Iodic acid dehydrates to iodine pentaoxide when heated at 180°C:
2HIO3 → I2H5 + H2O
Iodic acid is a relatively weak monoprotic acid, the Ka value at 25°C is 1.6 x 10–1. Several species have been detected in concentrated aqueous solutions, which include IO3¯, H+, HIO3, (HIO3)2 and (HIO3)3. Its solution turns blue litmus red and then bleaches the litmus paper because of its strong oxidizing properties.
When heated with potassium iodate, potassium hydrogen iodate is formed:
HIO3 + KIO3 → KH(IO3)2
An aqueous solution of iodic acid is a strong oxidizing agent. It liberates iodine from iodides:
IO3¯ + 5I¯ + 6H+ → 3I2 + 3H2O or,
HIO3 + 5HI → 3I2 + 3H2O
In an aqueous solution, iodic acid oxidizes hydrogen sulfide to sulfur:
2HIO3 + 5H2S → I2 + 6H2O + 5S
The solid iodic acid reacts vigorously with sulfur, phosphorus and other nonmetals.
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