SODIUM CHROMATE, 4-HYDRATE
Sodium chromate tetrahydrate
CAS: 10034-82-9
Molecular Formula: CrH8Na2O8
SODIUM CHROMATE, 4-HYDRATE - Names and Identifiers
SODIUM CHROMATE, 4-HYDRATE - Physico-chemical Properties
| Molecular Formula | CrH8Na2O8 |
| Molar Mass | 234.03 |
| Density | 2.73 |
| Melting Point | 792℃ |
| Water Solubility | Soluble in water. |
| Appearance | Crystals |
| Color | Yellow |
| Odor | Odorless |
| Exposure Limit | ACGIH: TWA 0.0002 mg/m3; STEL 0.0005 mg/m3 (Skin)OSHA: Ceiling 0.1 mg/m3NIOSH: IDLH 15 mg/m3; TWA 0.0002 mg/m3 |
| Merck | 14,8601 |
| PH | pH (10g/l, 25℃) : 8.0～10.0 |
| Stability | Stable. Incompatible with strong reducing agents, combustible materials, strong acids. Deliquescent. |
| Sensitive | Hygroscopic |
| Physical and Chemical Properties | Yellow translucent triclinic crystal or crystalline powder. soluble in water, slightly soluble in ethanol. |
| Use | Mainly used in the manufacture of chemical reagents, chromium products and pigments |
SODIUM CHROMATE, 4-HYDRATE - Risk and Safety
| Risk Codes | R45 - May cause cancer R46 - May cause heritable genetic damage R60 - May impair fertility R61 - May cause harm to the unborn child R21 - Harmful in contact with skin R25 - Toxic if swallowed R26 - Very Toxic by inhalation R34 - Causes burns R42/43 - May cause sensitization by inhalation and skin contact. R48/23 - R50/53 - Very toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment. |
| Safety Description | S53 - Avoid exposure - obtain special instructions before use. S45 - In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) S60 - This material and its container must be disposed of as hazardous waste. S61 - Avoid release to the environment. Refer to special instructions / safety data sheets. |
| UN IDs | UN 3288 6.1/PG 2 |
| WGK Germany | 3 |
| RTECS | GB2958300 |
| TSCA | Yes |
| Hazard Class | 6.1 |
| Packing Group | II |
SODIUM CHROMATE, 4-HYDRATE - Upstream Downstream Industry
| Raw Materials | Sodium hydroxide Sodium Dichromate |
SODIUM CHROMATE, 4-HYDRATE - Reference Information
| EPA chemical substance information | information provided by: ofmpeb.epa.gov (external link) |
| solubility in water (g/100ml) | grams dissolved per 100ml of water at different temperatures (℃): 31.7g/0 ℃;50.1g/10 ℃;84g/20 ℃;88g/30 ℃;96g/40 ℃ 115g/60 ℃;125g/80 ℃;126g/100 ℃ |
| toxicity | sodium chromate is corrosive to skin and mucous membranes, and can cause dermatitis and chromium ulcers. When the eye is contaminated, it causes conjunctivitis. If there is sodium chromate solution or dust on the skin, immediately rinse with soap water or tap water; If you accidentally splash in the eyes, you should immediately rinse with a large amount of water for 15 min. The maximum allowable concentration (Cr) in air is 0.05~0.1 mg/m3. At work, you must wear work clothes, latex gloves, rubber aprons, and personal protective masks. Production equipment should be sealed and well ventilated to prevent gas emissions and dust from flying. After work, be sure to take a shower, there is a broken wound on the skin, should be coated with protective ointment. |
| Application | mainly used in the manufacture of chemical reagents, chromium salt products and pigments, etc. Mainly used in ink, paint, pigment, metal corrosion inhibitors, organic synthetic oxidants, and tanning and dyeing. used as analytical reagent, rust inhibitor, mordant and tanning agent, also used in organic synthesis oxidant, mordant, rust inhibitor. |
| production method | for the preparation of products with low sulfate content, sodium dichromate mother liquor and sodium chromate alkaline solution should be used. Sodium chromate alkaline solution was added to the neutralizer by neutralization method, followed by sodium dichromate mother liquor. After filtration, aluminum residue was removed, and the sodium chromate filtrate was evaporated and concentrated to above 50 ° Bé, containing sodium chromate about 700g/L(Na2Cr2O7 · 2H2O), the feed liquid must be clarified to prevent suspended impurities from entering the crystal, and then cooled to below 40 ℃, after solid-liquid separation, the mother liquor is returned to evaporate, the crystals were dried below 68 ° C. To obtain a sodium chromate product. The precipitate obtained in the clarification process can be returned to the sodium chromate alkaline solution neutralization process. |
Last Update：2024-04-10 22:39:43
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Raw Materials for SODIUM CHROMATE, 4-HYDRATE