Oxalic acid test solution(ChP)
Oxalic acid dihydrate
CAS: 6153-56-6
Molecular Formula: C2H6O6
Oxalic acid test solution(ChP) - Names and Identifiers
| Name | Oxalic acid dihydrate |
| Synonyms | Has two acid Oxalate Acid OXALIC ACID 2HYD XTL Two water oxalic acid Oxalic acid dihydrate ethanedioic acid dihydrate Ethanedioic acid, dihydrate Oxalic acid test solution(ChP) oxalic acid free acid dihydrate Oxalic acid dihydrate Manufacturer OXALIC ACID, DIHYDRATE, HIGH PURITYOXALIC ACID, DIHYDRATE, HIGH PURITYOXALIC ACID, DIHYDRATE, HIGH PURITYOXALIC ACID, DIHYDRATE, HIGH PURITY |
| CAS | 6153-56-6 |
| EINECS | 612-167-2 |
| InChI | InChI=1/C2H2O4.2H2O/c3-1(4)2(5)6;;/h(H,3,4)(H,5,6);2*1H2 |
| InChIKey | GEVPUGOOGXGPIO-UHFFFAOYSA-N |
Oxalic acid test solution(ChP) - Physico-chemical Properties
| Molecular Formula | C2H6O6 |
| Molar Mass | 126.07 |
| Density | 1,65 g/cm3 |
| Melting Point | 104-106°C(lit.) |
| Boling Point | 108-109°C |
| Flash Point | 157°C |
| Water Solubility | 138 g/L (20 ºC) |
| Solubility | Soluble in water (143 mg/ml at 20 °C), ethanol (400 mg/ml), ether (10 mg/ml), and gly |
| Vapor Presure | <0.01 mm Hg ( 20 °C) |
| Vapor Density | 4.4 (vs air) |
| Appearance | Crystallization |
| Specific Gravity | 1.65 |
| Color | Yellow to yellow-green |
| Exposure Limit | TLV-TWA for anhydrous acid 1 mg/m3(ACGIH, MSHA, and OSHA); TLV-STEL2 mg/m3 (ACGIH). |
| Merck | 14,6911 |
| BRN | 3679436 |
| PH | ~1.0 (25℃, 1M in H2O) |
| Storage Condition | Store at +5°C to +30°C. |
| Stability | Stable. Incompatible with bases, acid chlorides, steel, silver, silver compounds, moisture. Avoid contact with metals. |
| MDL | MFCD00149102 |
| Physical and Chemical Properties | This product is a colorless transparent monoclinic crystal. It is usually present as a dihydrate. The melting point was 101-102 °c. Relative density (19 degrees C) 1.65. Refractive index 1.440. Soluble in water, slightly soluble in ether and ethanol. 157 degrees C sublimation. Anhydrous oxalic acid is formed by the easy weathering and dehydration of dihydrate. The melting point of the anhydrous substance was 189.5 ° C. (decomposition). |
| Use | It is weathered in warm and dry air and is soluble in water and ethanol. No smell. 150-160 ℃ sublimation. It can be weathered in high-heat dry air. 1g soluble in 7ml of water, 2ml of boiling water, 2.5ml of ethanol, 1.8ml of boiling ethanol, 100ml of ether, 5.5ml of glycerol, insoluble in benzene, chloroform and petroleum ether. The pH value of 0.1mol/L solution is 1.3. Low toxicity, median lethal dose (rabbit, transdermal) 2000mg/kg. |
Oxalic acid test solution(ChP) - Risk and Safety
| Risk Codes | R21/22 - Harmful in contact with skin and if swallowed. R41 - Risk of serious damage to eyes |
| Safety Description | S24/25 - Avoid contact with skin and eyes. S39 - Wear eye / face protection. S37 - Wear suitable gloves. S36 - Wear suitable protective clothing. S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. |
| UN IDs | UN 3261 8/PG 3 |
| WGK Germany | 1 |
| RTECS | RO2450000 |
| TSCA | Yes |
| HS Code | 29171100 |
| Hazard Class | 8 |
| Packing Group | III |
| Toxicity | LD50 orally in Rabbit: 375 mg/kg |
Oxalic acid test solution(ChP) - Introduction
It is weathered in warm and dry air and is soluble in water and ethanol. No smell. 150-160 ℃ sublimation. It can be weathered in high-heat dry air. 1g soluble in 7ml of water, 2ml of boiling water, 2.5ml of ethanol, 1.8ml of boiling ethanol, 100ml of ether, 5.5ml of glycerol, insoluble in benzene, chloroform and petroleum ether. The pH value of 0.1mol/L solution is 1.3. Low toxicity, median lethal dose (rabbit, transdermal) 2000mg/kg.
Last Update：2022-10-16 17:27:09
Oxalic acid test solution(ChP) - Reference Information
| pH range of acid-base indicator discoloration | 6 - 8 at 25°C |
| sublimation point | 157°C |
| NIST chemical information | information provided by: webbook.nist.gov (external link) |
| EPA chemical substance information | information provided by: ofmpeb.epa.gov (external link) |
| Introduction | oxalic acid, also known as "gallic acid", scientific name "oxalic acid". The molecular formula is (COOH)2 · 2H2O. It is a colorless transparent monoclinic crystal, which is often present in the form of calcium salt in plants such as rhubarb. It is strongly acidic, not easy to burn, toxic, soluble in hot water, ethanol and glycerol, slightly soluble in ether, harmful to the eyes, corrosive to the skin, and stronger in water, people can be poisoned to death by 2 grams. |
| Application | oxalic acid can be used as reducing agent, bleaching agent, decontamination reagent, analytical reagent, anhydrous as dehydrating agent in organic synthesis. In addition, oxalic acid can be prepared into oxalate to play a role |
| preparation | a method for preparing oxalic acid by Catalytic Hydrolysis of oxalate resin, comprising the following steps: 1) the ion exchange resin is washed with deionized water and dried, and the water content in the ion exchange resin is determined at the same time; 2) weigh and take 200-300 parts by mass of deionized water; 10 parts by mass of oxalate and 6.5-13 parts by mass of ion exchange resin, wherein the water-Ester mass ratio of the constituent components is 19:1-30:1, the water in the water-Ester mass ratio includes water in the ion exchange resin and deionized water; 3) deionized water and ion exchange resin are added to the open reactor, heating to 55-75 °c and constant stirring of the ion exchange resin; At the same time, the oxalate is sealed and heated to 55-75 °c; 4) The oxalate is rapidly transferred to the reaction vessel with constant stirring, 5) timing sampling determination of oxalic acid, oxalic acid ester content, when the reactor oxalate content is less than 0.005%, stop stirring and heating; 6) the bottom liquid in the reactor was produced and the produced oxalic acid was separated from water by a rectification reaction. |
| Use | is used as a complexing agent in acid tin plating, and its complex salt with tin tetrachloride is dissolved in the tin plating solution. The general dosage is 24~25g/L. It can also be used for copper polishing. Aluminum in oxalic acid anodizing and Hard anodizing solutions, as well as in sulfate iron plating and brush plating baths. |
| production method | ethylene glycol oxidation method ethylene glycol was added to a reaction kettle and air-oxidized at 130 °c. The product was obtained by post-treatment. Or, ethylene glycol and water are added into the reaction kettle, heated to 80~85 ℃, 98% nitric acid is added under intense stirring, after reacting for 4 h, it is cooled to 25 ℃ and filtered, and the product is crystallized. Propylene oxidation method 60% ~ 70% of nitric acid is added into the reaction kettle, at 10~40 deg C into the olefin, (two ingredients ratio 1: 0.1) stirred and dissolved heated to 50~65 deg C, nitrogen oxides were removed. The crystals were cooled to 20 °c and filtered and dried to give a product. |
Last Update：2024-04-10 22:29:15
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