silveriodide,colloidal
Silver iodide
CAS: 7783-96-2
Molecular Formula: AgI
silveriodide,colloidal - Names and Identifiers
| Name | Silver iodide |
| Synonyms | neosilvol Silver iodide SILVER IODIDE silvermonoiodide SILVER(I) IODIDE silver(1+)iodide Silver(I) iodide silver(1+) iodide silveriodide(agi) Silver iodide (AgI) silveriodide,colloidal Silveriodideyellowpowder |
| CAS | 7783-96-2 |
| EINECS | 232-038-0 |
| InChI | InChI=1/Ag.HI/h;1H/q+1;/p-1 |
silveriodide,colloidal - Physico-chemical Properties
| Molecular Formula | AgI |
| Molar Mass | 234.77 |
| Density | 5.68 g/mL at 25 °C (lit.) |
| Melting Point | 557°C |
| Boling Point | 1506°C |
| Water Solubility | 0.03 mg/L |
| Solubility | Easily soluble in cyanide alkali and iodide alkali solution, soluble in concentrated hydroiodic acid, bromide alkali, chloride alkali, thiocyanate alkali, thiosulfate alkali, mercury nitrate and silver nitrate solution, almost insoluble in water, acid other than hydroiodic acid and ammonium carbonate solution |
| Appearance | Solid |
| Specific Gravity | 6.01 |
| Color | Yellow |
| Exposure Limit | ACGIH: TWA 0.01 ppm |
| Solubility Product Constant(Ksp) | pKsp: 16.07 |
| Merck | 14,8516 |
| Storage Condition | RT, dark |
| Stability | Stability Light-sensitive. Incompatible with strong oxidizing agents. |
| Sensitive | Light Sensitive |
| MDL | MFCD00003412 |
| Physical and Chemical Properties | The character of alpha type is a bright yellow hexagonal crystal. relative density 5.683(30 ℃)(α-type) soluble in potassium cyanide, sodium thiosulfate, potassium iodide, slightly soluble in concentrated ammonia. |
| Use | Used as a catalyst in developer and artificial precipitation |
silveriodide,colloidal - Risk and Safety
| Risk Codes | R36/37/38 - Irritating to eyes, respiratory system and skin. R53 - May cause long-term adverse effects in the aquatic environment |
| Safety Description | S22 - Do not breathe dust. S24/25 - Avoid contact with skin and eyes. |
| UN IDs | UN 3077 9 / PGIII |
| WGK Germany | 3 |
| RTECS | VW4450000 |
| FLUKA BRAND F CODES | 8 |
| TSCA | Yes |
| HS Code | 28432900 |
| Hazard Class | 9 |
silveriodide,colloidal - Nature
Open Data Verified Data
bright yellow odorless microcrystalline powder. The relative density is 5. 67 and the melting point is 552 ℃. Silver iodide, whether solid or liquid, is photosensitive. Under the action of light, it is decomposed into a "silver core" of very small particles, and gradually becomes a gray-black color with green. Insoluble in water and dilute acid, slightly soluble in ammonia, and concentrated ammonia when heated together, due to the formation of silver iodide ammonia complex crystals, and white. Soluble in potassium iodide, potassium cyanide, sodium thiosulfate solution and hot nitric acid. Thermal decomposition of toxic iodide smoke.
Last Update：2024-01-02 23:10:35
silveriodide,colloidal - Preparation Method
Open Data Verified Data
A silver iodide precipitate is obtained by reacting potassium iodide with silver nitrate, and the precipitate is washed and dried. The reaction process should be protected from light, and the exposure operation should be performed only when the silver iodide containing no impurities is obtained.
Last Update：2022-01-01 08:59:06
silveriodide,colloidal - Introduction
No smell. When encountering air and light, it gradually turns black. It can slowly react with boiling concentrated acid without reacting with hot hydroxide alkali solution.
Last Update：2022-10-16 17:28:46
silveriodide,colloidal - Use
Open Data Verified Data
In the photosensitive industry, a photographic emulsion can be produced by mixing silver iodide and silver bromide, and can be used as a raw material for a thermoelectric battery in the battery industry. It can also be used as an ice nucleation agent for artificial rainfall.
Last Update：2022-01-01 08:59:06
silveriodide,colloidal - Safety
Open Data Verified Data
Contact or inhalation of this product can cause damage to the skin, eyes and respiratory tract. Long-term exposure can cause local or systemic silver deposition, local or systemic skin deposition. The staff should be protected, and if it is touched, it should be washed with water immediately. Store in a cool, ventilated warehouse. Keep away from fire and heat source. Keep the container sealed. It should be stored separately from oxidants and acids, and mixed storage should not be avoided.
Last Update：2022-01-01 08:59:07
silveriodide,colloidal - Reference Information
| crystal Structure | Cubic, sphaloride Structure - Space Group F(-4)3M |
| NIST chemical information | information provided by: webbook.nist.gov (external link) |
| EPA chemical substance information | information provided by: ofmpeb.epa.gov (external link) |
| Introduction | silver iodide chemical formula AgI, there are alpha, beta two kinds of crystal form. Α-type is bright yellow odorless microcrystalline Hexagonal powder, black in light, relative density 5.68330, refractive index 2.21, 2.22. Insoluble in water and dilute acid, slightly soluble in concentrated ammonia, and concentrated ammonia co-heated, due to the generation of AgI · 1/2NH3 or 2AgI · NH3 crystals, it turns into white, soluble in potassium cyanide, sodium thiosulfate, potassium iodide solution and hot concentrated nitric acid. |
| Application | the mixture of silver iodide and silver bromide can produce photographic emulsion, which is used as ice nucleation agent in artificial rainfall, and can also prevent hail, snow, storm and Typhoon, can be used as raw materials for thermal batteries. It is used as a catalyst in some reactions. |
| preparation | by reaction of iodide ions with silver salt solution, alternatively, the metal iodide solution is added to the hot silver nitrate solution in the dark and reacted. |
| toxicity | see iodine. |
| Use | used as catalyst in developer and artificial precipitation used as analytical reagent silver iodide mixed with silver bromide, photographic emulsions can be manufactured. In artificial rainfall, used as ice nucleation agent; Also can prevent hail, frost, snow and Storm. It can be used as a raw material for a thermoelectric battery. Used as a catalyst in chemical reactions. It is also used in the pharmaceutical industry. microanalysis of cesium. Artificial rainfall. Photography. Pharmaceutical. |
| production method | double decomposition method potassium iodide solution with a relative density of 1.1 was added to the reactor, the silver nitrate solution with a relative density of 1.1 to 1.2 was slowly added with vigorous stirring until the excess of the potassium iodide solution was about 3%. At this time, a yellow silver iodide precipitate was formed, which was allowed to stand, filtered, washed with distilled water, centrifuged, and dried below 70 ° C. To obtain a silver iodide finished product. The above procedures of KI + AgNO3 → AgI ↓ + KNO3 should be performed in a dark room or under red light. The filtered mother liquor is recovered and potassium nitrate is by-produced. |
| 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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