10117-38-1
potassium sulfite
CAS: 10117-38-1
Molecular Formula: K2O3S
10117-38-1 - Names and Identifiers
| Name | potassium sulfite |
| Synonyms | Kaliumsulfit potassium sulfite POTASSIUM SULFITE potassium sulphite POTASSIUM SULPHITE dipotassium sulfite Potassium sulfide an Potassium sulfite solution Sulfurousacid, potassium salt sulfurous acid, monopotassium salt potassium sulfite potassiumsulphite |
| CAS | 10117-38-1 |
| EINECS | 233-321-1 |
| InChI | InChI=1/K.H2O3S/c;1-4(2)3/h;(H2,1,2,3) |
10117-38-1 - Physico-chemical Properties
| Molecular Formula | K2O3S |
| Molar Mass | 158.2598 |
| Solubility | Soluble in water, |
| Appearance | White powder |
| Merck | 13,7761 |
| Storage Condition | Room Temprature |
| Sensitive | `sensitive` to humidity and light |
| MDL | MFCD00011387 |
| Physical and Chemical Properties | White odorless coarse powder. Oxidation in air to sulfate. Easily soluble in water (1g/3.5 m1). Insoluble in ethanol. The aqueous solution is alkaline, and when exposed to acid, it decomposes and releases sulfur dioxide. There is strong reducibility. |
| Use | Used as a general reagent, also used in the photo industry |
10117-38-1 - Risk and Safety
| Hazard Symbols | Xi - Irritant |
| Risk Codes | R36/37/38 - Irritating to eyes, respiratory system and skin. R31 - Contact with acids liberates toxic gas |
| Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S36 - Wear suitable protective clothing. |
| WGK Germany | 1 |
| FLUKA BRAND F CODES | 9 |
| Toxicity | ADI 0～0.7(以SO2计；FAO/WHO，2001)。 |
10117-38-1 - Introduction
It is easy to change color in the air. Very easy to absorb moisture. Sexual instability, impact or rapid heat caused by explosion. The aqueous solution is strongly alkaline. It's corrosive.
Last Update：2022-10-16 17:11:29
10117-38-1 - Reference Information
| application | potassium sulfite (chemical formula: K2SO3) is an inorganic compound. It is a white odorless granular powder at room temperature. It is mainly used as a food preservative. |
| Preparation | Similar to other alkali metal sulfites, potassium sulfite can be prepared by passing sulfur dioxide into potassium hydroxide solution. If sulfur dioxide is excessive, Potassium bisulfite is obtained. Zinc powder or sodium amalgam can reduce potassium sulfite to potassium dithionite (K2S2O4). |
| identification test | 5% of the sample solution was positive for potassium test (IT-27) and sulfite test (IT-30). Solubility is easily soluble in water and hardly soluble in ethanol (OT-42). |
| content analysis | accurately weigh about 750mg of the sample, dissolve in a mixed solution made of 100.0 ml of 0.1mol/L iodine and 5ml of dilute hydrochloric acid test solution (TS-117), titrate excess iodine with 0.1mol/L sodium thiosulfate, and add starch test solution (TS-235) as an indicator. 0.1mol/L iodine per ml is equivalent to 7.912mg of potassium sulfite (K2SO3). |
| toxicity | ADI 0~0.7 (calculated as SO2; FAO/WHO,2001). |
| usage limit | FAO/WHO(1984,mg/kg): quick-frozen French fried potatoes 50 (calculated as SO4); Quick-frozen lobster, raw product 100, cooked product 30 (calculated as SO2); Pineapple juice 500 with preservatives (calculated as SO2, only for manufacturing). |
| chemical properties | white odorless coarse powder. Oxidation in air to sulfate. Easily soluble in water (1g/3.5 m1). Insoluble in ethanol. The aqueous solution is alkaline, and when exposed to acid, it decomposes and releases sulfur dioxide. There is strong reducibility. |
| use | preservative; Antioxidants; Bleaching agent; Anti-browning agent. Antioxidant. Developer for analysis. Used as a general reagent and also used in the photography industry |
| production method | sulfur dioxide is introduced into potassium carbonate aqueous solution to saturate it, then the same amount of sodium carbonate is added and obtained by evaporation and crystallization. |
| EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
| toxic substance data | information provided by: pubchem.ncbi.nlm.nih.gov (external link) |
Last Update：2024-04-09 20:52:54
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