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Hydriodic acid

Outline Toxicity Production method Chemical Properties Uses Category Explosive hazardous characteristics Flammability hazard characteristics Storage Characteristics Extinguishing agent

CAS No.10034-85-2
Chemical Name:Hydriodic acid
Synonyms:Hydriodic;caswellno482c;Hydrogeniodid;hydrogen Hydrideiodine;Hydri0dic acid;HYDRIODIC ACID;HYDRIOTIC ACID;Hydroidic acid;Jodwasserstoff
Molecular Formula:HI
Formula Weight:127.91
MOL File:10034-85-2.mol
Hydriodic acid Property
Boiling point : 127 °C(lit.)
density : 1.96 g/mL at 20 °C
Fp : 126-127°C
storage temp. : Refrigerator (+4°C)
Water Solubility : soluble
Sensitive : Hygroscopic
Merck : 14,4776
Stability:: Stable. Incompatible with bases, amines. Corrodes steel. May discolour on exposure to air and light.
CAS DataBase Reference: 10034-85-2(CAS DataBase Reference)
NIST Chemistry Reference: Hydrogen iodide(10034-85-2)
EPA Substance Registry System: Hydriodic acid(10034-85-2)
Hazard Codes : C
Risk Statements : 34-35
Safety Statements : 26-36/37/39-45-9
RIDADR : UN 1787 8/PG 2
WGK Germany : -
RTECS : MW3760000
F : 8
HazardClass : 8
PackingGroup : II
Hazardous Substances Data: 10034-85-2(Hazardous Substances Data)

Hydriodic acid Chemical Properties,Usage,Production

hydriodic acid is a strong acid. Chemical Formula is HI. The molecular weight is 127.91. Colorless gas, pale yellow liquid or blob solid. There is a strong pungent odor. Melting point is -50.8 ℃, the boiling point is -35.38 ℃, relative density is 5.660 (gas), 2.85-4.7 (liquid), the refractive index is 1.46616. And form a white acid mist with water vapor in the air, easily soluble in water and emit a lot of heat to generate Hydriodic acid. Slightly soluble in ethanol. Unstable, heated to decompose into hydrogen and iodine under the light. Significantly decomposition above 300 ℃. Its constant boiling solution is colorless or light yellow fuming liquid, boiling point is 127 ℃, relative density is 1.7015, strong acid (degree of dissociation of 0.1 mol·L-1 hydroiodic solution up to 95%), the solubility of Hydriodic acid in an organic solvent is much smaller than in water, present in non-electrolytes or weak electrolytes, its ionization constant in pyridine is 3 × 10-3. Easily break down into hydrogen and iodine in the air. With a strong reduction, It has the strongest reducibility in hydrohalic acids, may be oxidated to free iodine by Cl2, Br2, concentrated sulfuric acid. Oxidation by air at room temperature, can be oxidated by concentrated nitric acid, concentrated sulfuric acid. It reacts with most metals to form the corresponding iodide and hydrogen. Method: by heating reaction of sodium iodide and phosphoric acid or reaction of phosphorus with iodine, water was added dropwise on a mixture of phosphorus and iodine, can also be derived by suspending iodine in water and ventilation with hydrogen sulfide. Its constant boiling solution is derived by ventilating Hydriodic acid gas into the water. Uses: its constant boiling solution is often used as a reducing agent, a disinfectant, analytical reagents, preparation of iodized salt, synthetic drugs, dyes, perfumes and so on. It is synthesized by iodine vapor and hydrogen under platinum catalytic conditions or derived by hydrolysis of phosphorus triiodide.
The above information is edited by Yan Yanyong of Chemicalbook.
It is highly corrosive to most metals, Non-combustible. But it reacts violently with fluorine, potassium nitrate, potassium chlorate and so on. As hydrochloric acid, it has a strong irritation, gases or vapors can irritate the eyes and respiratory system. Liquid can burn the skin. The patient who inhaled vapors should immediately keep away from the contaminated area, put to rest and keep warm. Accidentally splashed into the eyes, rinse immediately with plenty of water for 15min. Contact with skin, wash immediately with plenty of water. Swallowed immediately rinse mouth, rushed to the hospital for treatment.
Production method
Slowly add iodine and red phosphorus to a reactor filled with water, and react under stirring, filter the reaction solution, and distill the filtrate, collect fractions of 125 ~ 130 ℃, obtain Hydroiodic.
2P + 5I2 → 2PI5
PI5 + 4H2O → 5HI + H3PO4
Chemical Properties
Hydroiodic acid is aqueous solution of Hydriodic acid. When fresh, it is colorless, soon precipitates iodine with yellow to brown in air and sunlight. Azeotrope (56.9% HI), the relative density is 1.70. Boiling point is 127 ℃. Goods hydroiodic are divided into three types: 57% HI, relative density is 1.70. 47% HI, relative density is 1.5. 1% HI, relative density is 1.1. Add 1.5% hypophosphorous acid to make it bleach. The critical temperature is 150 ℃: the critical pressure is 8.3MPa. The dielectric constant is 3.57 at -45 ℃. Conductivity is 8.5 × 10-10S · cm-1. Heat of vaporization is 19.76 Kj / mol, melting heat is 2.87 Kj / mol. Easily soluble in water, soluble in organic solvents.
1. Used for producing organic iodide. As general reagents and pharmaceutical intermediates.
2. Used as the analysis reagents, also used in the preparation of the iodide.
3. Used as a reducing agent, also used in the synthesis of alkyl iodine and other alkyl iodide.
4. Used for Determination of methoxy, ethoxy and selenium, dissolution of acid-insoluble inorganic substance, such as an alkaline earth metal sulfate and mercury iodide and so on. Used as a reducing agent. Used for the preparation of iodide.
5. Used for Determination of methoxy, dissolution of acid-insoluble (especially hot) inorganic substance, such as an alkaline earth metal sulfate and mercury iodide and so on. Used as a reducing agent.
Compressed gas and liquefied gas.
Explosive hazardous characteristics
Contacting with alkali metals can be explosive, thermal decomposition into toxic iodine vapor in the case of heat, produce toxic hydroiodic in the case of water.
Flammability hazard characteristics
Combustible in case of N,N-dinitroso pentamethylene tetramine, release hydrogen cyanide gas in case of cyanide toxic, thermal decomposition of toxic iodide gases.
Storage Characteristics
Treasury ventilation, low-temperature drying and stored separately from cyanide, N,N-dinitroso pentamethylene tetramine, bases.
Extinguishing agent
Chemical Properties
Clear liquid, colourless to slightly yellow
General Description
A colorless to yellow liquid with a pungent odor. Consists of a solution of hydrogen iodide in water. Fumes irritate the eyes and mucous membranes. Corrosive to metals and to tissue.
Air & Water Reactions
Soluble in water with release of heat.
Reactivity Profile
HYDROIODIC ACID reacts exothermically with organic bases (amines, amides) and inorganic bases (oxides and hydroxides of metals). Reacts exothermically with carbonates (including limestone and building materials containing limestone) and hydrogen carbonates to generate carbon dioxide. Reacts with sulfides, carbides, borides, and phosphides to generate toxic or flammable gases. Reacts with many metals (including aluminum, zinc, calcium, magnesium, iron, tin and all of the alkali metals) to generate flammable hydrogen gas. Reacts violently with acetic anhydride, 2-aminoethanol, ammonium hydroxide, calcium phosphide, chlorosulfonic acid, 1,1-difluoroethylene, ethylenediamine, ethyleneimine, oleum, perchloric acid, b-propiolactone, propylene oxide, silver perchlorate/carbon tetrachloride mixture, sodium hydroxide, uranium(IV) phosphide, vinyl acetate, calcium carbide, rubidium carbide, cesium acetylide, rubidium acetylide, magnesium boride, mercury(II) sulfate [Lewis]. Mixtures with concentrated sulfuric acid can evolve toxic hydrogen iodide gas at a dangerous rate. Decomposes at high temperatures to emit toxic products. Reacts with fluorine, dinitrogen trioxide, nitrogen dioxide/dinitrogen tetraoxide, and fuming nitric acid.
Health Hazard
TOXIC; inhalation, ingestion or skin contact with material may cause severe injury or death. Contact with molten substance may cause severe burns to skin and eyes. Avoid any skin contact. Effects of contact or inhalation may be delayed. Fire may produce irritating, corrosive and/or toxic gases. Runoff from fire control or dilution water may be corrosive and/or toxic and cause pollution.
Fire Hazard
Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive and/or toxic fumes. Some are oxidizers and may ignite combustibles (wood, paper, oil, clothing, etc.). Contact with metals may evolve flammable hydrogen gas. Containers may explode when heated.
Hydriodic acid Preparation Products And Raw materials
Raw materials
Preparation Products
4-IODOPYRIDINE-2-CARBOXYLIC ACID Ammonium iodide 2-BROMO-3-IODO-ISONICOTINIC ACID DL-Isoleucine 2-IODO-ISONICOTINIC ACID 2-Iodopyridine Potassium iodide 3-IODO-2-NITROPYRIDINE 6-CYANOPURINE 4-Hydroxypyrimidine 6-IODO-PYRIDINE-2-CARBOXYLIC ACID METHYL ESTER Pyrazolo[1,5-a]pyridine-3-carboxylic acid 4-IODOQUINOLINE 3,3'-Dihydroxybenzidine 3,4-Dihydroxyphenylethanol Iodine XANTHURENIC ACID Indazole NEROL 4-Amino-2,5-dichlorophenol 1-FLUORENECARBOXYLIC ACID 6-Iodopurine 2-Amino-6-iodopurine
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acideiodhydrique(french) acidoyodhidrico Anhydrous hydriodic acid anhydroushydriodicacid caswellno482c epapesticidechemicalcode046912 Hydri0dic acid hydridodichlorotris(triphenylphosphine)iridium(iii)hydriodicacid hydriodicacid,solution Hydrogeniodid hydrogeniodide(hi) hydrogeniodide,anhydrous Hydrogen-iodide-anhydrous- hydrogeniodidesolution Hydrogenmonoiodide iodured’hydrogeneanhydre(french) yodurodehidrogenoanhidro General Use Puriss p.a. Puriss p.a. ACS IODINE TITRATION INDICATOR HYDRIODIC ACID HYDRIOTIC ACID HYDROIODIC ACID HYDROGEN IODIDE 10034-85-2 Analytical Chromatography Product Catalog Analytical Reagents Hydriodic acid (47% in water) Hydriodicacidaqsoln hydroiodic acid 47% hydroiodic acid 55-58% Hydroiodic acid 57% (stab.) hydroiodic acid 67% Hydroidic acid HYDRIODIC ACID, UNSTABILIZED, 55%, A.C.S . REAGENT Hydroiodic acid, <60% HYDRIODIC ACID, 57 WT. % IN WATER, DISTILLED, STABILIZED, 99.95% HYDROIODIC ACID 47%, ACS, STAB. HYDRIODIC ACID 57 %, STABILIZED WITH H3P O2 HYDRIODIC ACID, 47+%, A.C.S. REAGENT, ST ABILIZED HYDRIODIC ACID 57 WT. % IN WATER & HYDRIODIC ACID, 57 WT. % IN WATER, DISTI LLED, UNSTABILIZED, 99.99% HYDRIODIC ACID 57 WT. % IN WATER DIST& HYDROIODIC ACID 55-58% ACS PACKED IN & HYDRIODIC ACID 57 %, R. G., STABILIZED W ITH HYPOPHOSPHOROUS ACID HYDRIODIC ACID UNSTABILIZED 55% & HYDRIODIC ACID 47+% A.C.S. REAGENT & HydriodicAcid57%Gr(WithStabilizer) Hydriodic acid, 57% aq. soln. hydrogen  HYDRIODIC ACID(AMPULE) Hydriodic acid, 57 wt.% aqueous solution, distilled, stabilized, for analysis Hydriodic acid, 57 wt.% aqueous solution, distilled, unstabilized, for analysis HYDRIODIC ACID, 47% REAGENT (ACS) HYDRIODIC ACID, 55% REAGENT (ACS) hydriodic acid, acs Jodwasserstoff
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