Iodic acid CAS 7782-68-5
Introduction：Basic information about Iodic acid CAS 7782-68-5, including its chemical name, molecular formula, synonyms, physicochemical properties, and safety information, etc.
Iodic acid Basic informationPhysical Properties Uses Preparation
| Product Name: | Iodic acid |
| Synonyms: | IODIC (V) ACID;IODIC ACID;HYDROGEN IODATE;10dicacid;Iodic acid, 99% min.;Iodic acid ACS reagent, >=99.5%;Iodic acid puriss. p.a., ACS reagent, >=99.5% (RT);Iodic Acid ( Solution ) |
| CAS: | 7782-68-5 |
| MF: | HIO3 |
| MW: | 175.91 |
| EINECS: | 231-962-1 |
| Product Categories: | Inorganics;Acids&Bases;ACS GradeChemical Synthesis;Essential Chemicals;Inorganic Acids;Synthetic Reagents;Pharmaceutical Intermediates;bc0001;YP00036 |
| Mol File: | 7782-68-5.mol |
Iodic acid Chemical Properties
| Melting point | 110°C (dec.) |
| density | 4.63 g/cm3 |
| solubility | Water (Slightly) |
| pka | 1.28±0.53(Predicted) |
| form | Solid |
| color | White to off-white |
| Specific Gravity | 4.629 |
| PH | pKa1= 0.70(25℃) |
| Water Solubility | 269 g/100 mL (20 ºC) |
| Sensitive | Light Sensitive |
| Merck | 14,5012 |
| Stability: | Stable. Incompatible with strong reducing agents, alcohols, organic materials. Light-sensitive. |
| InChI | 1S/HIO3/c2-1(3)4/h(H,2,3,4) |
| InChIKey | ICIWUVCWSCSTAQ-UHFFFAOYSA-N |
| SMILES | OI(=O)=O |
| CAS DataBase Reference | 7782-68-5(CAS DataBase Reference) |
| EPA Substance Registry System | Iodic acid (7782-68-5) |
Safety Information
| Hazard Codes | O,C |
| Risk Statements | 8-34 |
| Safety Statements | 17-26-36/37/39-45 |
| RIDADR | UN 3085 5.1/PG 2 |
| WGK Germany | 3 |
| F | 8 |
| TSCA | TSCA listed |
| HazardClass | 5.1 |
| PackingGroup | II |
| HS Code | 28111980 |
| Storage Class | 5.1B - Oxidizing hazardous materials |
| Hazard Classifications | Ox. Sol. 2 Skin Corr. 1B |
| 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. |
| 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] |
| Physical properties | Iodic acid, HIO3, can be obtained as a white solid. Itdissolves in water very well, but it also exists in thepure state, as opposed to chloric acid or bromic acid.Iodic acid contains iodine in the oxidation state+5and it is one of the most stable oxo-acids of the halogensin its pure state. When iodic acid is carefully heated, itdehydrates to iodine pentoxide. On subsequent heating,the iodine pentoxide further decomposes, givinga mixture of iodine, oxygen and lower oxides of iodine. Iodic acid can be produced by oxidizing I2 withchlorine in an aqueous solution. Iodic acid can beused to synthesize sodium or potassium iodate salts(which are used in salt as a source of iodine in thehuman body. |
| Uses | Iodic acid is used in analytical chemistry laboratories to standardize solutions of both weak and strong bases using methyl red or methyl orange as the indicator. It acts as a key starting material to synthesize sodium or potassium iodate, thereby increasing the iodine content of salt. |
| Uses | A strong acid in analytical chemistry. |
| 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). |
| Preparation | Iodic acid may be prepared by the reaction of sulfuric acid with bariumiodate. The solution is filtered to remove barium sulfate and then crystallizedto 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 diluteacidic solutions: I2 + 5Cl2 + 6H2O → 2HIO3 + 10HCl Another method of preparation involves oxidation of iodine with hydrogenperoxide: 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 1.6x10-1. Several species have been detected in concentrated aqueous solutions,which include IO3-, H+, HIO3, (HIO3)2 and (HIO3)3. Its solution turns blue lit-mus red and then bleaches the litmus paper because of its strong oxidizingproperties. 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 non-metals. |
| 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. |
| Hazard | Toxic by ingestion, strong irritant to eyesand skin. |
| 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.] |
Iodic acid Preparation Products And Raw materials
| Raw materials | Iodine |
| Preparation Products | Iopanoic acid-->Calcium iodate-->3-IODO-2,4,5-TRIMETHYLTHIOPHENE-->Dicofol-->Direct Black 103-->disodium 5-(4-(4-sulphophenylazo)phenylazo)salicylate-->FLOSEQUINAN-->3-Amino-2,4,6-triiodobenzoic acid |
