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Properties of sodium hypochlorite?

2009-03-30View Original

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This post was last edited by sunjl1981 on 2013-1-6 at 19:54. What are the chemical properties of sodium hypochlorite? Will it explode when mixed with brackish water or chlorine water? What will be the consequences? Please help solve this issue. # , , &
Reply #22009-03-30
It will not explode. The following information is from Baidu. Part 1: Chemical name. Chinese name of the chemical: Sodium hypochlorite. English name of the chemical: Sodium hypochlorite. Other Chinese names: Bleach. Other English names: Hypochlorous acid, Sodium sait, Bleach. Technical data code: 919. CAS No.: 7681-52-9. Molecular formula: NaClO. Molecular weight: 74.44. Part 2: Composition/information on components. CAS Nos. of harmful components: Sodium hypochlorite solution – 7681-52-9. Part 3: Overview of hazards. Hazard category: …… Routes of exposure: …… Health hazards: Workers who frequently come into contact with this substance may experience excessive sweating in their palms, thinning nails, and hair loss. This product has an allergenic effect. The free chlorine released by this product may cause poisoning.   Environmental hazards: Flammability and explosion risk: This product is non-flammable, but it is corrosive and can cause burns to the human body; it is also allergenic. Part 4: First Aid Measures Skin contact: Remove contaminated clothing and rinse thoroughly with plenty of flowing water.   Eye contact: Lift the eyelids and rinse with flowing water or saline. Seek medical attention.   Inhalation: Quickly move to a place with fresh air. Keep the airways clear. If there is difficulty breathing, administer oxygen. If breathing stops, perform artificial respiration immediately. Seek medical attention.   Ingestion: Drink plenty of warm water and induce vomiting. Seek medical attention. Part V: Fire-fighting measures Hazardous characteristics: Decomposes under high heat to produce toxic and corrosive fumes. It is corrosive.   Harmful combustion products: Chlorides.   Fire extinguishing method: Use fogged water, carbon dioxide, or sand to extinguish the fire. Part 6: Emergency Response to Leaks  Emergency measures: Quickly evacuate people from the area affected by the leak to a safe zone, and isolate it while strictly restricting access. It is recommended that emergency responders wear self-contained positive-pressure breathing apparatus and acid-alkali resistant protective clothing. Do not come into direct contact with the spill. Seal the source of the leak as much as possible. Minor leaks: Absorb with sand, vermiculite, or other inert materials. Large-scale leakage: Build dikes or dig pits to contain it. Cover with foam to reduce vapor hazards. Transfer using a pump into a tank truck or specialized collector, and recycle it or transport it to a waste disposal facility for disposal. Part 7: Handling, Disposal, and Storage Handling precautions: Operate in a sealed environment with adequate ventilation. Operators must receive specialized training and strictly adhere to the operating procedures. It is recommended that operators wear direct-type gas masks (half-masks), chemical safety goggles, corrosion-resistant work clothing, and rubber gloves. Prevent steam from leaking into the workplace air. Avoid contact with alkalis. Handle with care during transportation to prevent damage to the packaging and containers. Equipped with leak emergency response equipment. Empty containers may still contain harmful substances.   Storage precautions: Store in a cool, well-ventilated warehouse. Keep away from flames and heat sources. The storage temperature should not exceed 30°C. It should be stored separately from alkalis; mixed storage is strictly prohibited. The storage area should be equipped with emergency response equipment for leaks and appropriate containment materials. Part 8: Exposure Control/Personal Protection Occupational Exposure Limits China’s MAC (mg/m3): No standard established Former Soviet Union’s MAC (mg/m3): No standard established TLVTN: No standard established TLVWN: No standard established Monitoring Methods: Engineering controls: Enclosed production processes and comprehensive ventilation. Provide safety showers and eye wash stations.   Respiratory protection: In environments with high concentrations, a direct-type gas mask (half-mask) should be worn.   Eye protection: Wear chemical safety goggles.   Personal protection: Wear anti-corrosion work clothes.   Hand protection: Wear rubber gloves.   Other protections: Smoking, eating, and drinking are prohibited at the work site. Work is done, take a shower**. Pay attention to personal hygiene. Part 9: Physical and Chemical Properties Major components: Content: Industrial grade (based on available chlorine); Grade 1: 13%; Grade 2: 10%.   Appearance and properties: A slightly yellow solution with an odor similar to that of chlorine.   pH: Melting point (°C): -6 Boiling point (°C): 102.2 Relative density (water=1): 1.10 Relative vapor density (air=1): No data available Saturated vapor pressure (kPa): No data available Heat of combustion (kJ/mol): Not applicable Critical temperature (°C): No data available Critical pressure (MPa): No data available Logarithm of octanol/water partition coefficient: No data available Flash point (°C): Not applicable Ignition temperature (°C): Not applicable Upper explosive limit (% V/V): Not applicable Lower explosive limit (% V/V): Not applicable Solubility: Soluble in water.   Main uses: It is used for water purification, as a disinfectant, and in pulp bleaching; it is also used in the pharmaceutical industry to produce chloramine and similar substances.   Other physical and chemical properties: Part 10: Stability and Reactivity Stability: Incompatible substances: Bases.   Conditions to avoid contact: Polymerization hazards: Decomposition products: Part 11: Toxicological data Acute toxicity: LD50: 8500 mg/kg (oral, in mice) LC50: No data Subacute and chronic toxicity: Irritation: Sensitization: Mutagenicity: Teratogenicity: Carcinogenicity: Part 12: Ecological data Ecotoxicity: Biodegradability: Abiodegradability: Bioaccumulation: Other harmful effects: No data available. Part Thirteen: Disposal of Waste Nature of the waste: Methods of waste disposal: Relevant ** and local regulations should be consulted prior to disposal. Dispose of it using safe burial methods.   Disposal precautions: Part XIV: Transport information Hazardous goods code: 83501 UN number: 1791 Packaging mark: Packaging category: O53 Packaging method: Ordinary wooden box or semi-grilled wooden box enclosing acid-resistant jars or ceramic bottles ; Ordinary wooden box or semi-grilled wooden box outside the glass bottle or plastic barrel (jar) ; Ordinary wooden box outside the frosted-mouth glass bottle or threaded-mouth glass bottle ; Ordinary wooden box outside threaded-mouth glass bottles, iron-lid pressed-mouth glass bottles, plastic bottles, or metal drums/tanks ; Threaded-mouth glass bottles, plastic bottles, or tin-plated thin steel sheet drums (tanks), enclosed in bottom-grid boxes, fiberboard boxes, or plywood boxes.   Shipping notes: The packaging must be intact at the time of shipment, and the loading should be done carefully. During transportation, it is necessary to ensure that the container does not leak, collapse, fall, or get damaged. Mixing or transporting it together with alkalis, food chemicals, etc. is strictly prohibited. Transport vehicles should be equipped with emergency leakage response equipment during transportation. During transportation, it should be protected from exposure to sunlight and rain, as well as high temperatures. When transporting by road, follow the designated routes and do not stop in residential areas or densely populated zones. Part XV: Regulatory Information Regulatory information includes regulations such as the Regulations on the Safe Management of Chemical Hazardous Materials (issued by the State Council on February 17, 1987), the Detailed Rules for the Implementation of the Regulations on the Safe Management of Chemical Hazardous Materials (Document No. Hualao Fa 677), and the Provisions on the Safe Use of Chemicals in the Workplace (Document No. Laobu Fa 423). These regulations set out rules regarding the safe use, production, storage, transportation, and handling of chemical hazardous materials ; The Classification and Labelling of Commonly Used Hazardous Chemicals (GB 13690-92) classifies this substance as Category 8.3, Other Corrosives. Part 16: Properties It is a pale yellow, highly unstable solid that can explode easily when mixed with organic substances or reducing agents. Its aqueous solution is alkaline, and it slowly decomposes into NaCl, NaClO3, and O2; it decomposes rapidly when exposed to heat or light. It possesses strong oxidizing properties. Part 17: Preparation Chlorine gas is absorbed using a 30% to 35% NaOH aqueous solution at temperatures below 10 degrees Celsius. NaCl is then filtered out, and by cooling the mixture to -20 degrees Celsius, NaClO·5H2O crystals can be obtained. The crystalline water is removed under vacuum at temperatures below 10 degrees Celsius to yield the final product. Last edited by wang*neng on 2009-3-30 14:24
Reply #32009-03-30
Sodium hypochlorite reacts with brackish water or chlorine water, releasing chlorine—a yellow-green toxic gas. Because sodium hypochlorite is extremely unstable in acidic environments and will decompose. This post was last edited by What should I do? on 2009-3-30 11:43.]
Reply #42009-03-30
It will not explode; sodium hypochlorite decomposes into sodium chlorate, sodium chloride, and water, while releasing oxygen atoms. It is these oxygen atoms that are responsible for bleaching and sterilization. Brackish water combined with sodium hypochlorite uses free oxygen to decompose organic matter.
Reply #52009-03-30
It won’t explode, but sodium hypochlorite and hydrochloric acid should not be mixed together, as that will produce chlorine gas.
Reply #62009-03-31
It won’t explode; just learn about the chemical properties of chlorine to understand why. Check Baidu Knows for more information.
Reply #72009-03-31
You can obtain its data by directly querying the MSDS
Reply #82009-03-31
Sodium hypochlorite reacts chemically with brackish water or chlorine water, releasing chlorine gas. Moreover, when the temperature exceeds 75 degrees Celsius, a disproportionation reaction occurs: 3ClO- → 2Cl- + ClO3-
Reply #92009-04-07
Sodium hypochlorite is an oxidizing agent and does not explode.

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