Hydriodic acid
Hydriodic acid
CAS: 10034-85-2
Molecular Formula: HI
Hydriodic acid - Names and Identifiers
| Name | Hydriodic acid |
| Synonyms | Hydriodic acid Hydroiodic acid Hydrogen iodide Hydriodicacidaqsoln HYDRIODIC ACID(AMPULE) Hydriodic acid solution |
| CAS | 10034-85-2 |
| EINECS | 233-109-9 |
| InChI | InChI=1/HI/h1H |
Hydriodic acid - Physico-chemical Properties
| Molecular Formula | HI |
| Molar Mass | 127.91 |
| Density | 1.96g/mLat 20°C |
| Melting Point | -50.8° |
| Boling Point | 127°C(lit.) |
| Flash Point | 126-127°C |
| Water Solubility | soluble |
| Vapor Presure | 721.8kPa at 20℃ |
| Appearance | colorless or yellow gas |
| Color | Colorless to brown |
| Odor | Pungent odor |
| Exposure Limit | ACGIH: TWA 0.01 ppm |
| Merck | 14,4776 |
| pKa | -10(at 25℃) |
| PH | 3.01(1 mM solution);2.04(10 mM solution);1.08(100 mM solution) |
| Storage Condition | 2-8°C |
| Stability | Stable. Incompatible with bases, amines. Corrodes steel. May discolour on exposure to air and light. |
| Sensitive | Hygroscopic |
| Physical and Chemical Properties | Hydroiodic acid is an aqueous solution of hydrogen iodide. Fresh as colorless, in the air and sunlight in the rapid precipitation of iodine and yellow to brown. Azeotropic mixture (56.9% HI); Relative density 1.70. Boiling point 127 °c. Commodity hydroiodic acid is divided into three kinds: 57% HI, relative density of 1.70;47% HI, relative density of 1.5;1%HI, relative density of 1.1. 1.5% hypophosphorous acid was added to decolorize it. The critical temperature of 150 deg C: the critical pressure of 8.3MPa. The dielectric constant was 3.57 at -45 °c. Conductivity 8.5 x 10-10S cm-1. Heat of vaporization: 19.76 Kj/mol; Heat of fusion: 2.87 Kj/mol. Soluble in water; Soluble in organic solvents. |
| Use | Used as an analytical reagent and also for the preparation of iodide |
Hydriodic acid - Risk and Safety
| Hazard Symbols | C - Corrosive |
| Risk Codes | R34 - Causes burns R35 - Causes severe burns |
| Safety Description | 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 the label whenever possible.) S9 - Keep container in a well-ventilated place. |
| UN IDs | UN 1787 8/PG 2 |
| WGK Germany | - |
| RTECS | MW3760000 |
| FLUKA BRAND F CODES | 8 |
| TSCA | Yes |
| HS Code | 28111990 |
| Hazard Class | 8 |
| Packing Group | II |
Hydriodic acid - Upstream Downstream Industry
| Raw Materials | Iodine Hydrogen sulfide |
| Downstream Products | Potassium iodide Ammonium iodide |
Hydriodic acid - Nature
Open Data Verified Data
colorless liquid. Is an aqueous solution of hydrogen iodide. There is a strong stimulating taste. Boiling point 127 deg C; d 1.70. The pH value of 0. Imol/L solution was 1. Oxidation reactions can occur when exposed to air. In the case of cyanide can produce highly toxic hydrogen cyanide gas. Strong corrosive acid, can corrode rubber. Miscible with water and ethanol.
Last Update：2024-01-02 23:10:35
Hydriodic acid - Preparation Method
Open Data Verified Data
iodine and red phosphorus or yellow phosphorus were put into water for reaction. After completion of the reaction, the fraction at 125-130 ° C. Was collected by filtration and distillation to obtain hydroiodic acid.
Last Update：2022-01-01 09:02:01
Hydriodic acid - Use
Open Data Verified Data
Analytical reagents for the determination of selenium, Methoxy, ethoxy and solvents for certain substances.
Last Update：2022-01-01 09:02:02
Hydriodic acid - Safety
Open Data Verified Data
has strong corrosive effect. Its vapor or smoke has a strong irritating effect on the eyes, skin, mucous membranes and respiratory tract. Should be stored separately from H foaming agent, metal powder, flammable, combustible, alkali, etc.
Last Update：2022-01-01 09:02:02
Hydriodic acid - Reference Information
| pH indicator color change ph range | 1 |
| NIST chemical information | Information provided by: webbook.nist.gov (external link) |
| EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
| Overview | The aqueous solution of hydrogen iodide is called "hydroiodic acid", which is a strong acid. Chemical formula HI. Molecular weight 127.91. Colorless gas, light yellow liquid or mass solid. There is a strong irritating smell. Melting point -50.8 ℃, boiling point -35.38 ℃, relative density 5.660 (gas), 2.85-4.7 (liquid), refractive index 1.46616. In the air, it forms a white acid mist with water vapor, which is easily soluble in water and releases a lot of heat to form hydroiodic acid. Slightly soluble in ethanol. Unstable, when heated, light will decompose into iodine and hydrogen. Obviously decomposed above 300 ℃. Its azeotropic solution is a colorless or light yellow fuming liquid, with a boiling point of 127 ℃, a relative density of 1.7015, a strong acid (0.1 mol · L-1 hydroiodic acid solution dissociation degree can reach 95%), and the solubility of hydrogen iodide in organic solvents It is much weaker than in water, showing a non-electrolyte or weak electrolyte, and the ionization constant in pyridine is 3 × 10-3. The air is easily decomposed into iodine and hydrogen. It has strong reducibility and is the strongest reducibility among hydrohalic acids. It can be oxidized by Cl2, Br2, and concentrated sulfuric acid to free iodine. It is oxidized by air at room temperature and can be oxidized by concentrated nitric acid and concentrated sulfuric acid. Reacts with most metals to form corresponding iodide and hydrogen. |
| application | constant boiling solution of hydrogen iodide is often used as reducing agent, disinfectant, analytical reagent, preparation of iodized salt, synthetic drugs, dyes, spices, etc. |
| Preparation method | It can be heated by sodium iodide and phosphoric acid or reacted with phosphorus and iodine, and water is added to the mixture of phosphorus and iodine drop by drop. It can also be obtained by passing hydrogen sulfide by suspending iodine in water. Its constant boiling solution is obtained by introducing hydrogen iodide into water. It is synthesized by iodine vapor and hydrogen under platinum catalysis or hydrolyzed by phosphorus triiodide. |
| toxicity | is highly corrosive to most metals. Not burning. But it reacts violently with fluorine, potassium, nitric acid, potassium chlorate, etc. Same as hydrochloric acid; It is strongly irritating, and gas or vapor can stimulate the eyes and respiratory system. Liquid can burn the skin. Patients who suck human vapors should be immediately removed from the contaminated area, placed to rest and keep warm. Inadvertently splashed into the eyes, immediately rinse with plenty of water for 15min. Skin contact immediately rinse with plenty of water. Wash your mouth immediately after taking it by mistake. Urgently sent to hospital for treatment. |
| use | manufacture of organic iodide. General Reagents. Intermediates for medicine. Used as an analytical reagent, also used in the preparation of iodide Used as a reducing agent, also used in the synthesis of iodide and other iodides Determination of methoxy, ethoxy and selenium. Dissolve acid-insoluble inorganic substances, such as sulfate of alkaline earth metals and mercury iodide. Reducing agent. Preparation of iodide. determination of methoxy group, dissolved (especially hot) acid insoluble inorganic substances, such as alkaline earth metal sulfate and mercury iodide, reducing agent |
| production method | iodine and red phosphorus are slowly added to the reactor containing water respectively, reacted under stirring, filtered the reaction solution, distilled the filtrate, and collected fractions at 125~130 ℃. Produce hydroiodic acid. Its 2P 5I2 → 2PI5 PI5 4H2O → 5HI H3PO4 |
| category | compressed gas and liquefied gas |
| dangerous characteristics of explosives | explosive contact with alkali metals; decomposition of toxic iodine vapor when heated; toxic hydroiodic acid when exposed to water |
| flammability hazard characteristics | flammable in case of h-hole agent; toxic hydrogen cyanide gas in case of cyanide; thermal decomposition of toxic iodide gas |
| storage and transportation characteristics | warehouse ventilation and low temperature drying; Store separately from cyanide, h-porogen and alkali. |
| fire extinguishing agent | water |
| toxic substance data | information provided by: pubchem.ncbi.nlm.nih.gov (external link) |
Last Update：2024-04-10 22:29:15
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