hypo
Sodium thiosulfate pentahydrate
CAS: 10102-17-7
Molecular Formula: H10Na2O8S2
hypo - Names and Identifiers
| Name | Sodium thiosulfate pentahydrate |
| Synonyms | HYPO ametox nsc-45624 Sulfothiorine disodium sulfurothioate SodiuM thiosulfate pentahydra Sodiumthiosulfate,pentahydrat Sodium thiosulfate pentahydrate Sodium thiosulphate pentahydrate SODIUM THIOSULFATE-5-HYDRATE EXTRA PURE, Thiosulfuricacid,disodiumsalt,pentahydrate SODIUM THIOSULFATE PENTAHYDRATE, CRYSTAL LIZED Thiosulfuricacid(H2S2O3)disodiumsalt,pentahydrate thiosulfuricacid(h2s2o3),disodiumsalt,pentahydrate SodiuM Thiosulfate, 0.100 N Aqueous Solution, USP VoluMetric SolutionAPHA |
| CAS | 10102-17-7 |
| EINECS | 600-156-5 |
| InChI | InChI=1/Na.H2O3S2.5H2O/c;1-5(2,3)4;;;;;/h;(H2,1,2,3,4);5*1H2/q+1;;;;;;/p-2 |
| InChIKey | AKHNMLFCWUSKQB-UHFFFAOYSA-L |
hypo - Physico-chemical Properties
| Molecular Formula | H10Na2O8S2 |
| Molar Mass | 248.18 |
| Density | 1.01g/mLat 25°C |
| Melting Point | 48.5 °C |
| Boling Point | 100 C |
| Water Solubility | 680 g/L (20 ºC) |
| Solubility | Easily soluble in water, the aqueous solution is nearly neutral. Soluble in turpentine and ammonia. Insoluble in alcohol. |
| Appearance | White crystal |
| Specific Gravity | 1.729 |
| Color | White tranparent |
| Odor | Odorless |
| Merck | 14,8694 |
| PH | 6.0-7.5 (100g/l, H2O, 20℃) |
| Storage Condition | Store at +5°C to +30°C. |
| Stability | Stable. Incompatible with strong acids, iodine, mercury. |
| MDL | MFCD00149186 |
| Physical and Chemical Properties | Character: colorless monoclinic crystal. Odorless, with a cool and bitter taste. Melting Point: 40~45 ℃ relative density: 1.729(17 ℃) The solubility is easily soluble in water, and the aqueous solution is nearly neutral. Soluble in turpentine and ammonia. Insoluble in alcohol. |
| Use | Used in photography, film, textile, chemical fiber, paper, leather, pesticide industry |
hypo - Risk and Safety
| Hazard Symbols | Xi - Irritant |
| Risk Codes | 36/37/38 - Irritating to eyes, respiratory system and skin. |
| Safety Description | S24/25 - Avoid contact with skin and eyes. S37/39 - Wear suitable gloves and eye/face protection S36 - Wear suitable protective clothing. S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. |
| WGK Germany | 1 |
| RTECS | WE6660000 |
| FLUKA BRAND F CODES | 10 |
| TSCA | Yes |
| HS Code | 28323000 |
| Toxicity | LD50 orally in Rabbit: > 5000 mg/kg |
hypo - Upstream Downstream Industry
hypo - Reference
| Reference Show more | 1. [IF=4.171] Ya-ping Huang et al."Protective effect and mechanism of Monascus-fermented red yeast rice against colitis caused by Salmonella enterica serotype Typhimurium ATCC 14028."Food Funct. 2020 Jul;11(7):6363-6375 2. [IF=3.352] Mengdi Xu et al."Morphological characterization of postembryonic development of blood–spleen barrier in duck."Poultry Sci. 2020 Aug;99:3823 |
hypo - Nature
Open Data Verified Data
colorless transparent monoclinic crystal. Melting Point: 48 ℃; Relative density: 1. 69. Soluble in water, when dissolved endothermic, insoluble in ethanol. Deliquescence in moist air. Weathering in air above 33 ℃. Can be oxidized by air, with reduction. Can dissolve silver halide. When heated to 100 ° C, 5 crystal water is lost, and the burning is decomposed into sodium sulfide and sodium sulfate.
Last Update：2025-06-10 22:55:16
hypo - Preparation Method
Open Data Verified Data
sodium sulfite heptahydrate was added and dissolved in water, and the rod-shaped sulfur was sufficiently pulverized and then put into a sodium sulfite heptahydrate solution. After heating and boiling, sulfur was completely dissolved, filtration was performed, and the filtrate was concentrated until crystals began to precipitate. After cooling, Suction filtration crystallization, available five sodium thiosulfate hydrate.
Last Update：2025-06-10 22:55:16
hypo - Introduction
Soluble with water and turpentine, hardly soluble in ethanol. Dry air above 33°C is weathered, decomposed at 48°C, and burned to sodium sulfide and sodium sulfate. The aqueous solution is weakly alkaline. In case of strong acid, it decomposes and precipitates sulfur and sulfur dioxide.
Last Update：2022-10-16 17:11:29
hypo - Application
Open Data Verified Data
used in photography as a fixer. Also used for electroplating, tanning leather and fabric printing and dyeing.
Last Update：2025-08-19 16:24:40
hypo - Reference Information
| pH indicator color change ph range | 6-8.5 |
| EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
| Use | Used as a dechlorination agent after bleaching of pulp and cotton fabrics, used as a chelating agent and antioxidant in the food industry, and used as a detergent and disinfectant in the pharmaceutical industry Used for dehydrochlorination of natural gas, naphtha, synthesis gas, hydrogen nitrogen and other gases to protect downstream catalysts from poisoning. If the gas contains organic chlorine, it should be converted into hydrogen chloride by cobalt molybdenum hydrogenation catalyst, and then the hydrogen chloride is absorbed by dechlorination agent. Used as analytical reagent, mordant and fixer Suitable for the removal of chlorine such as hydrogen, nitrogen, syngas, carbon monoxide, carbon dioxide, naphtha, etc. The photosensitive industry is used as a photographic fixer. The paper industry is used as a dechlorination agent after pulp bleaching. The printing and dyeing industry is used as a dechlorination agent for cotton fabrics after bleaching. Analytical chemistry is used as a reagent for chromatography and capacity analysis. Used as detergent and disinfectant in medicine. The food industry is used as a chelating agent, antioxidant, etc. used as complexing agent for silver plating of thiosulfate. The silver plating layer has fine crystallization and good covering ability. The general dosage is 200~250g/l. As a brightener in cyanide silver plating. The dosage is 0.5~1.09g/l. The crystals of silver can be aligned to obtain bright and semi-bright silver plating layers. used in photography, film, textile, chemical fiber, papermaking, leather making, pesticide industry chromatography analysis reagents, drip analysis to determine cobalt, photographic fixer, chlorine removal agent capacity analysis commonly used reagents, determination of blood sodium, preparation of injection and disaccharide iron urea medium, mordant. |
| production method | sodium sulfide neutralization method: if the main components of the waste liquid used are Na2S and a small amount of Na2CO3, it is first concentrated to 21~22 ° Bé, clarified and then pumped into the absorption tower to absorb sulfur dioxide gas. The absorption endpoint is controlled at pH value of 6.4~7.0. After the absorption liquid is clarified and preheated, it is fed into a concentrated pot, added with an appropriate amount of sulfur powder, heated and stirred, the liquid is concentrated to 54~58 ° Bé, denitrification is carried out in a denitrification device, and then slowly stirred, and cooled and crystallized under slow cooling conditions. Centrifugal separation and drying under nitrogen protection to obtain the finished product. sodium sulfite method dissolves soda ash with water, soda ash solution reacts with sulfur dioxide gas, adds caustic soda to neutralize, adds sulfide alkali to remove impurities, filters, and then dissolves sulfur powder in hot sodium sulfite solution for reaction. After filtration, impurity removal, re-filtration, caustic soda for alkali treatment, concentration, filtration, crystallization, centrifugal dehydration, screening, the preparation of sodium thiosulfate products. Its Na2CO3 SO2 → Na2SO3 CO2 ↑ Na2SO3 S 5H2O → Na2S2O3?5H2O alkali sulfide method uses alkali sulfide evaporation residue, barium sulfide wastewater (containing: sodium carbonate and sodium sulfide) to prepare raw material liquid and sulfur dioxide reaction, after clarification, adding sulfur powder for heating reaction, after evaporation, cooling crystallization, washing, separation, screening, the preparation of sodium thiosulfate finished products. Its 2Na2S Na2CO3 4SO2 → 3Na2S2O3 CO2 ↑ 2Na2S 3Na2CO3 6SO2 2S → 5Na2S2O3 3CO2 ↑ comprehensive method uses the lower foot waste containing sodium sulfide, sodium sulfite and a small amount of caustic soda after proper treatment and heating reaction with sulfur yellow, and the reaction hot solution is oxidized by air to generate sodium thiosulfate. In addition, crude sodium sulfite and sulfur reaction to produce sodium thiosulfate and crude sodium thiosulfate crystals are mixed, decolorized, filtered, concentrated, re-decolorized, filtered, crystallized, and centrifuged to produce sodium thiosulfate finished product. Its 2Na2S 2S 3O2 → 2Na2S2O3N a2SO3 S → Na2S2O36NaOH 6S → Na2S2O3 2Na2S2 3H2O recrystallization method crude sodium thiosulfate crystallization dissolution (or crude sodium thiosulfate solution), after impurity removal, concentration, crystallization, sodium thiosulfate. The purified gas by-product method uses the solution (containing sodium thiosulfate) in the desulfurization process of the coke oven gas arsenic-alkali method. First, sulfuric acid is used to precipitate the arsenic salt as arsenic trisulfide, and then neutralize with alkali, remove iron, concentrate and crystallize, Coarse crystal plus alkali to remove iron and recrystallize to obtain sodium thiosulfate. The preparation method of NC2302 uses industrial nitric acid to completely dissolve zinc ingots and calcium oxide, put them into a neutralization tank, and neutralize with lye to generate precipitation. Absorb the supernatant, rinse the precipitate, and then filter, dry, mix, shape, and sift to obtain the finished product. |
| category | articles burning in contact with water |
| toxicity classification | low toxicity |
| acute toxicity | abdominal cavity-mouse LD50: 5600 mg/kg |
| explosive hazard characteristics | explosive in case of acid and water |
| flammability hazard characteristics | Combustible gas emitted by water, humid air and oxidant |
| storage and transportation characteristics | warehouse ventilation and low temperature drying; separate from oxidant, halogen and strong acid |
| fire extinguishing agent | dry powder, dry sand, carbon dioxide |
Last Update：2024-04-09 15:16:46
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View History
Raw Materials for hypo
Downstream Products for hypo
Thiosulfuric acid, S,S'-(2-(dimethylamino)-1,3-propanediyl) ester, disodium salt
Fomesafen
Sodium thiosulfate
Bromoform
Fomesafen
Sodium thiosulfate
Bromoform