Sodium iodide dihydrate
Sodium iodide dihydrate
CAS: 13517-06-1
Molecular Formula: H4INaO2
Sodium iodide dihydrate - Names and Identifiers
| Name | Sodium iodide dihydrate |
| Synonyms | SODIUM IODIN SODIUM IODIDE 2 H2O SODIUM IODIDE, HYDROUS SODIUM IODIDE 2-HYDRATE Sodium iodide dihydrate SODIUM IODIDE DIHYDRATE sodiumato iodido dihydrate Sodium iodide dihydrate, for analysis |
| CAS | 13517-06-1 |
| EINECS | 683-359-1 |
| InChI | InChI=1/HI.Na.2H2O/h1H;;2*1H2/q;+1;;/p-1 |
Sodium iodide dihydrate - Physico-chemical Properties
| Molecular Formula | H4INaO2 |
| Molar Mass | 185.92 |
| Density | 2.448g/mLat 25°C(lit.) |
| Melting Point | 752 °C |
| Water Solubility | SOLUBLE |
| Vapor Density | >1 (vs air) |
| Appearance | Adhering Fine Crystals |
| Color | White |
| Storage Condition | Room Temprature |
Sodium iodide dihydrate - Risk and Safety
| Hazard Symbols | Xi - Irritant |
| Risk Codes | 36/38 - Irritating to eyes and skin. |
| Safety Description | 26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. |
| WGK Germany | 1 |
| HS Code | 28276000 |
Sodium iodide dihydrate - Reference Information
| product description | sodium iodide is a white solid formed by the reaction of sodium carbonate or sodium hydroxide with hydroiodic acid, and then evaporation of the solution, with anhydrous, dihydrate and pentahydrate. It is used as a raw material for iodine production, used in medicine and photography. The acidic solution of sodium iodide shows reducibility due to the formation of hydroiodic acid. Anhydrous, chemical formula NaI. Molecular weight 149.89. Colorless cubic crystals or white granules. The taste is salty and slightly bitter. Melting point 651 ℃, boiling point 1304 ℃, relative density 3.665(4 ℃), 3.607(25 ℃), refractive index 1.7745. Easily soluble in water (159.7 at 0 ℃, 179.3 at 20 ℃, 184 at 25 ℃, 190 at 30 ℃, 205 at 40 ℃, 227 at 50 ℃, 257 at 60 ℃, 296 at 80 ℃, 302 at 100 ℃), ethanol (43.3 at 25 ℃), methanol (65.0 at 10 ℃, 78.0 at 25 ℃, 80.7 at 40 ℃, 79 at 60 ℃, 4), acetone (30.0 at 20 ℃, 21.8 at 80 ℃), liquid ammonia and pyridine, soluble in glycerin. It has strong hygroscopicity. It gradually absorbs moisture in the air until the water content reaches 5%, and it can be oxidized and released by the air to turn brown. The aqueous solution is slightly alkaline, and there is the same change. A little alkali can be added to keep it stable. The pH of the aqueous solution is 8~9.5. It should be kept in a closed manner from light. The crystal is sodium iodide dihydrate, chemical formula NaI · 2H2O, molecular weight 185.92. Colorless crystal, deliquescent, easily soluble in water, ethanol and glycerin. Loss of crystal water above 65 ℃, melting point 752 ℃. It is reducible and is easily oxidized by oxygen in the air or aqueous solution to precipitate iodine and turn black. Should be protected from light and sealed. the transition temperature of pentahydrate, dihydrate and anhydrate is: NaI 5H2O ---(-13.5 ℃)--- NaI 2H2O ---(65 ℃)--- NaI sodium iodide is used as analytical reagent and microanalysis method is used to determine palladium, platinum and thallium. A cosolvent of iodine (sodium iodide forms a complex with iodine in an aqueous solution to increase the solubility of iodine), and can also be used as a raw material for pharmaceutical, photographic latex and single crystal production. |
| Related chemical reactions | react with chlorine or bromine to generate elemental iodine and sodium halide. (1) 2NaI Cl2 = 2NaCl I2 (2) 2NaI Br2 = 2NaBr I2 sodium iodide can react with acid to generate sodium salt of corresponding acid, and can also generate hydrogen iodide, hydroiodic acid or elemental iodine. (3)NaI H3PO4 = NaH2PO4 HI (4)2NaI H3PO4 = NaH2PO4 2HI (5)3NaI H3PO4 = Na3PO4 3HI (6)NaI H3Sb4 = NaH2SbO4 (white) HI (7)NaI H2SO4 (thick) = NaHSO4 HI (8)2NaI 3H2SO4 (thick) = 2NaHSO4 I2 2H2O (9) NaI HCl = NaCl HI the interaction of sodium iodide with hypochlorous acid, sodium chloride, sodium hydroxide and elemental iodine are generated. (10) 2NaI HOCl = NaCl NaOH I2 sodium iodide reacts with the following salts or oxides to generate different sodium salts. (11) NaI 6Ce(SO4)2 3H2O=NaIO3 3Ce2(SO4)3 3H2SO4 (12) 2NaI 4Ce(SO4)2 2HCl=Na2SO4 2Ce2(SO4)2 2ICl H2SO4 (13) NaI 3NaIO4=4NaIO3 (14) 2NaI 3NaIO4 3H2O=NaIO3 2Na2H3IO6 I2 (15) 2NaI 2CO2 H2O2=2NaHCO3 I2 (16) 2NaI MnO2 3H2SO4=2NaHSO4 MnSO4 I2 2H2O |
| drug and application | used for cystography, retrograde urography, T-tube cholangiography and fistula angiography in various parts. urography: 6.25% 100ml. Cystography: 6.25% 150ml. Retrograde pyelography: 12.5% 5~7ml. T-tube cholangiography: 12.5% 10~30ml. Fistula angiography: Determine the injection site and dose according to the condition. |
| X-ray contrast agent | X-ray contrast agent is a drug that uses the properties of X-ray that is easy to penetrate or not to penetrate as a contrast to make the inspected site develop. The contrast agents currently used in clinical practice are divided into two types: negative contrast agents (development density lower than human soft tissues) and positive contrast agents (development density higher than human soft tissues). Negative contrast agents include air, carbon dioxide and oxygen. The positive contrast agents were almost all iodide and organic iodine compounds except barium sulfate. Sodium iodide was first used in urography. The iodine-carbon bond in the organic iodine compound is quite stable, it is not easy to form iodine ions, and has little physiological effect on the human body. X-ray contrast agent can absorb X-ray when it reaches a certain concentration after being absorbed and properly concentrated in certain organs or tissues of the body, which can be used for imaging. They can be divided into two types: water-soluble and oil-soluble. According to different chemical types, the former can be divided into phthalides, organic acids, sulfonic acids and pyridone; the latter is mainly iodized oil. The ideal contrast agent should have the following requirements: clear development; non-toxic, no adverse reactions; easy to absorb and excrete; stable physical and chemical properties, can be stored for a long time without deterioration; easy to use; easy to manufacture, low price. |
| attention and taboos | is highly toxic and cannot be injected intravenously. Patients with liver and kidney insufficiency and iodine allergy should not be used. Iodine allergy test should be done before use. |
Last Update：2024-04-10 22:29:15
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