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Send EmailE337, Monopotassium Monosodium Tartrate Tetrahydrate, Sodium Potassium Tartrate, Potassium Sodium Tartrate Anhydrous, 6381-59-5
🧪 Chemical Overview
| Property | Details |
|---|---|
| Chemical Name | Sodium Potassium Tartrate Tetrahydrate |
| Formula | KNaC₄H₄O₆·4H₂O |
| CAS Number | 6381-59-5 |
| Molar Mass | 282.23 g/mol (tetrahydrate form) |
| Appearance | White crystalline powder |
| Solubility | Highly soluble in water; poorly soluble in alcohol |
| pH (aqueous solution) | Typically neutral to slightly basic (approx. 7–8.5) |
⚗️ Chemical Structure
It’s a double salt of tartaric acid, where one sodium ion (Na⁺) and one potassium ion (K⁺) neutralize the acid, creating a stable crystalline form with four water molecules of hydration.
🧭 Applications
1. Food Industry
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Identified as E337, used as a stabilizer and emulsifier.
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Enhances consistency and shelf life in food products.
2. Pharmaceuticals
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Mild laxative properties, used in some medicinal preparations.
3. Analytical Chemistry
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Component in Fehling's solution, used to test for reducing sugars.
4. Electronics
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Rochelle Salt is a piezoelectric material, meaning it can generate an electric charge under mechanical stress. It's been used in older microphones and phonograph pickups.
5. Industrial & Technical
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Acts as a complexing agent in metal finishing or plating baths.
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Sometimes used as a dispersant or stabilizer in formulations.
🌍 Trade and Logistics Considerations
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HS Code / GTIP: Typically falls under 2918.12 (Salts and esters of tartaric acid).
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Packaging: Commonly sold in 25 kg bags or drums, depending on moisture sensitivity.
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Storage: Store in a cool, dry place to preserve hydration state.
🏷️ Common Synonyms & Trade Names
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Rochelle Salt
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Seignette Salt
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E337 (Food additive code)
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Sodium Potassium Tartrate
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Potassium Sodium Tartrate
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Monopotassium Monosodium Tartrate
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Potassium Sodium L(+)-Tartrate Tetrahydrate
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Sodium Potassium L-Tartrate
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Sodium Potassium DL-Tartrate
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Potassium Sodium Tartrate Anhydrous
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Tartaric Acid Monopotassium Monosodium Salt
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2,3-Dihydroxybutanedioic Acid, Monopotassium Monosodium Salt
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Potassium Sodium (2R,3R)-2,3-Dihydroxybutanoate
These names vary depending on:
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Hydration state (anhydrous vs. tetrahydrate)
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Stereochemistry (L(+), DL forms)
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Application context (food, pharma, analytical chemistry)
Monopotassium monosodium tartrate tetrahydrate
CAS: 6381-59-5
Molecular Formula: KOCOCH(OH)CH(OH)COONa · 4H2O
Names and Identifiers
| Name | Monopotassium monosodium tartrate tetrahydrate |
| Synonyms | Sosiumpotassiumtartrate PotassiumSodiumTartrateFcc PotassiumSodium(+)TartrateGr PotassiumSodium(+)-TartrateA.R. PotassiumsodiumLtartratetetrahydrate sodium potassium tartrate tetrahydrate Potassium sodium tartrate tetrahydrate POTASSIUM SODIUM TARTRATE REAGENT (ACS) Sodium potassium L-tartrate tetrahydrate Potassium sodium L-tartrate tetrahydrate PotassiumSodium(+)TartrateGr-(RochelleSalt) Monopotassium monosodium tartrate tetrahydrate POTASSIUM SODIUM TARTRATE TETRAHYDRATE, PH HELV potassium sodium 2,3-dihydroxybutanedioate tetrahydrate |
| CAS | 6381-59-5 |
| EINECS | 206-156-8 |
| InChI | InChI=1/C4H6O6.K.Na.4H2O/c5-1(3(7)8)2(6)4(9)10;;;;;;/h1-2,5-6H,(H,7,8)(H,9,10);;;4*1H2/q;2*+1;;;;/p-2 |
Physico-chemical Properties
| Molecular Formula | KOCOCH(OH)CH(OH)COONa · 4H2O |
| Molar Mass | 282.22 |
| Density | 1.05g/mLat 20°C |
| Melting Point | 70-80 °C |
| Boling Point | 220°C |
| Specific Rotation(α) | 22.1 º (c=10, water) |
| Flash Point | 209.4°C |
| Water Solubility | 630 g/L (20 ºC) |
| Solubility | Soluble in water, almost insoluble in alcohol |
| Vapor Presure | 4.93E-08mmHg at 25°C |
| Appearance | Colorless translucent crystal or white crystalline powder |
| Color | White semi-transparent |
| Odor | Odorless |
| Maximum wavelength(λmax) | ['λ: 260 nm Amax: 0.026', , 'λ: 280 nm Amax: 0.022'] |
| Merck | 14,7670 |
| BRN | 6113568 |
| PH | 7.0-8.5 (25℃, 50mg/mL in H2O) |
| Storage Condition | Store at +5°C to +30°C. |
| Sensitive | Easily absorbing moisture |
| Refractive Index | 22 ° (C=10, H2O) |
| MDL | MFCD00150989 |
| Physical and Chemical Properties | Colorless translucent crystal or white crystalline powder. The melting point of 70-80 deg C, the relative density of 1.790. Loss of 3 crystal water at 100 ℃, loss of all crystal water at 130-140 ℃, and decomposition at 220 ℃. Soluble in water, insoluble in ethanol. The aqueous solution is slightly alkaline. The taste was salty and cool. |
| Use | This product is for scientific research only and shall not be used for other purposes. |
Risk and Safety
| Risk Codes | R22 - Harmful if swallowed R35 - Causes severe burns |
| Safety Description | S22 - Do not breathe dust. S24/25 - Avoid contact with skin and eyes. S45 - In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) S36/37/39 - Wear suitable protective clothing, gloves and eye/face protection. S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. |
| WGK Germany | 3 |
| TSCA | Yes |
| HS Code | 2918 13 00 |
Nature
colorless translucent crystal or white crystalline powder. d 11 79; Melting point 70~80. Dissolved in 0.9 water, the solution is slightly alkaline, pH 7~8. Practically insoluble in ethanol. It is slightly weathered in hot air. When heated to 100 ℃, it begins to lose some crystal water, and when heated to 130 ℃, it loses three water molecules, becomes anhydrous at 140-220 ℃, and decomposes at ℃.
Preparation Method
tartaric acid was neutralized with potassium hydroxide and sodium hydroxide.
Introduction
Slightly weathered in warm air, 3-component water is lost at 100 ℃, all water is lost at 130~140 ℃, and decomposition begins at 220 ℃. Soluble in 0.9 parts of water, almost insoluble in ethanol. The aqueous solution is slightly alkaline to litmus, pH 7~8. Prepare the Fei Lin solution. Determination of uric acid and sugar. Biochemical testing of serum proteins.
Use
used for the preparation of Ferrin solution and Banshi solution. Reducible sugars. A single crystal thereof is used as a piezoelectric element.
Reference Information
| pH range of acid-base indicator discoloration | 6.0 - 8.5 |
| Use | the pharmaceutical industry is used for the formulation of Furin's solution and the examination of reducing sugars for use as a laxative. The electroplating industry is used as a chemical copper deposition and as a complexing agent in cyanide copper plating. The chemical industry is used as a desulfurization agent for natural gas. The food industry is used for the preparation of baking powders. The mirror-making industry is used for silver mirror reaction and the like. As a chemical reagent, it is mainly used as a masking agent and for biochemical testing of serum proteins. reducing agent; Complexing agent; Laxative agent; Desulfurizing agent prepare feline's solution, masking agent, quantification of uric acid and sugar, determination of reducing agent, biochemical test of serum protein. Used in medicine; Reagent, The Mirror industry as a reducing agent, in telecommunications equipment used to make the crystal horn or crystal microphone. used as baking powder in food industry, used in plate making and mirror making |
| production method | is obtained by neutralizing tartaric acid with potassium hydroxide and sodium hydroxide. In a reaction pot equipped with a stirring and steam heating tube, Solid alkali and liquid potassium hydroxide were added, and water was added to dissolve. Tartaric acid was added with heating and stirring until the pH of the solution was 7. Hot Suction filtration, the filtrate was put into the crystallization Pan, cooling crystallization. After Suction filtration, the chloride is removed by washing with water, and the product is obtained after boiling and drying below 48 °c. |
