| Identification | More | [Name]
Sodium hypochlorite | [CAS]
7681-52-9 | [Synonyms]
ANTIFORMIN
HYPOCHLORITE
LIQUID BLEACH
LIQUID CHLORINE
SODA BLEACHING LYE
SODIUM HYPOCHLORITE
Sodium hypochlorite solution
TEEPOL BLEACH
b-kliquid
carrel-dakinsolution
caswellno776
chloros
chlorox
cloropool
clorox
cloroxliquidbleach
dakinssolution
deosan
deosangreenlabelsteriliser
diversolbx | [EINECS(EC#)]
231-668-3 | [Molecular Formula]
ClNaO | [MDL Number]
MFCD00011120 | [Molecular Weight]
74.44 | [MOL File]
7681-52-9.mol |
| Chemical Properties | Back Directory | [Appearance]
colourless liquid with strong odour | [Melting point ]
-16 °C
| [Boiling point ]
111 °C | [density ]
1.25 g/mL at 20 °C
| [vapor pressure ]
17.5 mmHg ( 20 °C) | [refractive index ]
1.3870 | [storage temp. ]
2-8°C
| [solubility ]
Methanol (Slightly), Water (Slightly) | [form ]
Solution | [color ]
Light yellow | [Specific Gravity]
1.209 | [Odor]
pale greenish to yel. liq., chlorine bleach odor | [Stability:]
Stable. Contact with acids releases poisonous gas ( chlorine ). Light sensitive. Incompatible with strong acids, amines, ammonia, ammonium salts, reducing agents, metals, aziridine, methanol, formic acid, phenylacetonitrile. | [Water Solubility ]
decomposes. | [Merck ]
14,8628 | [Dielectric constant]
6.7（Ambient） | [Exposure limits]
ACGIH: Ceiling 2 mg/m3
OSHA: TWA 2 mg/m3
NIOSH: IDLH 10 mg/m3; Ceiling 2 mg/m3 | [BCS Class]
1 | [LogP]
-3.42 at 20℃ | [CAS DataBase Reference]
7681-52-9(CAS DataBase Reference) | [EPA Substance Registry System]
7681-52-9(EPA Substance) |
| Safety Data | Back Directory | [Hazard Codes ]
C,Xi,N | [Risk Statements ]
R31:Contact with acids liberates toxic gas.
R34:Causes burns.
R36/38:Irritating to eyes and skin .
R36/37/38:Irritating to eyes, respiratory system and skin . | [Safety Statements ]
S26:In case of contact with eyes, rinse immediately with plenty of water and seek medical advice .
S36/37/39:Wear suitable protective clothing, gloves and eye/face protection .
S45:In case of accident or if you feel unwell, seek medical advice immediately (show label where possible) .
S36:Wear suitable protective clothing . | [RIDADR ]
UN 1791 8/PG 3 | [WGK Germany ]
2 | [RTECS ]
NH3486300 | [TSCA ]
Yes | [HazardClass ]
8 | [PackingGroup ]
III | [HS Code ]
28289000 | [Safety Profile]
Mddly toxic by ingestion. Human systemic effects by ingestion: somnolence, blood pressure lowering, corrosive to skin, nausea or vomiting. Human mutation data reported. An eye irritant. Corrosive and irritating by ingestion and inhalation. The anhydrous salt is highly explosive and sensitive to heat or friction. Explosive reaction with formic acid (at So), phenylacetonitrile. Reacts to form explosive products with amines, ammonium salts (e.g., ammonium acetate, (NH4)2CO3, ammonium nitrate, ammonium oxalate, (NH4)3P04), aziridme, methanol. Violent reaction with phenyl acetonitrile, cellulose, ethyleneimine. Solutions in water are storage hazards due to oxygen evolution. When heated to decomposition it emits toxic fumes of NaaO and Cl-. Used as a bleach. | [Hazardous Substances Data]
7681-52-9(Hazardous Substances Data) |
| Raw materials And Preparation Products | Back Directory | [Raw materials]
Sodium hydroxide-->Chlorine-->Calcium oxide-->Sodium chlorate-->Calcium carbide | [Preparation Products]
Vat Black 25-->Atrazine-->2-(Morpholinothio)benzothiazole-->Benz[cd]indol-2(1H)-one-->2,5-Dichloronicotinic acid-->4-Chloroimidazole-->4,6-DIMETHYL-PYRIMIDINE-2-SULFONYL FLUORIDE-->4-METHYL-PYRIMIDINE-2-SULFONYL FLUORIDE-->5-METHYL-PYRIMIDINE-2-SULFONYL FLUORIDE-->N-Cyclohexyl-2-benzothiazolesulfenamide-->4-Morpholineethanesulfonic acid-->1-PYRENECARBOXYLIC ACID-->3-METHYLTHIOPHENE-2-CARBONYL CHLORIDE-->2-CHLOROSULFONYL-PYRIDINIUM, CHLORIDE-->1,3-Dibromo-5,5-dimethylhydantoin-->Vat Brown 1-->1-Amino-2,4-dibromoanthraquinone-->3,5,6-TRICHLORO-PYRIDINE-2-CARBOXYLIC ACID-->3,3-Dimethylglutaric acid-->Vat Orange 11-->3-CHLORO-6-NITRO (1H)INDAZOLE-->6-AMINO-3-CHLORO (1H)INDAZOLE-->Iodoform-->IMMEDIAL BRILLIANT GREEN GB-->4-CHLORO-1H-PYRAZOLE-3-CARBOXYLIC ACID-->Chiniofon-->chlorinated sodium phosphate-->ETHYL ANTHRANILATE-->Magentagreencrystals-->Ruthenium(III) chloride-->C.I.Vat Red 29-->3,3-Dimethyl-2-oxobutyric acid-->MEQUINDOX-->4-CHLORO-3-METHYL-1H-PYRAZOLE-->1-Chlorobenzotrizole-->Direct Fast Yellow RR-->5-CHLOROPYRIDIN-2(1H)-ONE-->DIRECT YELLOW 29-->1,3-Dichloro-5,5-dimethylhydantoin-->3,5-DICHLORO-2-PYRIDONE |
| Hazard Information | Back Directory | [General Description]
Green to yellow watery liquid with an odor of bleaching liquid odor. Sinks and mixes with water. | [Reactivity Profile]
Salts of hypochlorous acid, HClO. Generally toxic, irritants and powerful oxidizers, particularly in the presence of water at higher temperature as they decompose to release oxygen and chlorine gases. On contact with urea they form the highly explosive NCl3 . When heated or on contact with acids, they produce highly toxic fumes of chlorine gas [Sax, 9th ed., 1996, p. 1905]. Can react with sulfuric acid to produce heat and chlorine gas. | [Air & Water Reactions]
Water soluble. Decomposes into chlorine and oxygen gases in hot water. | [Hazard]
Fire risk in contact with organic materials.
Toxic by ingestion, strong irritant to tissue.
| [Health Hazard]
Liquid can be irritating to skin and eyes if contact is maintained. | [Fire Hazard]
Behavior in Fire: May decompose, generating irritating chlorine gas. | [Physical properties]
Anhydrous sodium hypochlorite explodes; the pentahydrate is a pale-green crystalline solid; orthorhombic structure; density 1.6 g/cm3; melts at 18°C; decomposed by CO2 in the air; soluble in water, 29.3 g/100 mL at 0°C; the aqueous solution is highly stable. | [History]
Sodium hypochlorite exists as an aqueous solution from 5 15% NaOCl and is commonly called bleach. Household bleach is typically a 5.25% solution, and industrial bleach is sold as a 12% solution. When sodium hypochlorite is used in this entry, it is assumed to be the aqueous solution, which is clear, slightly yellow, corrosive, and has a distinctive chlorine smell. Chorine gas was discovered by Carl Wilhelm Scheele (1742 1786) in 1774 and known initially as depholgisticated salt spirit. In 1787, the French chemist Claude Louis Berthollet (1749 1822) experimented with aqueous solution of chlorine gas as bleaching agents. Based on Berthollet's work, the Javel Company located on the outskirts of Paris began to produce bleaches in 1788. Chlorine gas was dissolved in a solution of soda potash (potassium carbonate) to obtain a product called liqueur de Javel, which was potassium hypochlorite. Potash treated with chlorine gas was also used to produce bleaching powders. In 1820, Antoine Germaine Labarraque (1777 1850), an apothecary, substituted cheaper soda ash (sodium carbonate) for potash to produce Eau de Labarraque or Labarraque solution, which was sodium hypochlorite. Eau de Labarraque was used as a disinfectant and to bleach paper. Bleaching powders, borax, lye, and blueing were used as bleaches throughout the 19th century.
Sodium hypochlorite is the primary hypochlorite used as a bleach and disinfectant,
accounting for 83% of world hypochlorite use, with calcium hypochlorite accounting for
the remaining 17%. Approximately 1 million tons of sodium hypochlorite was used globally
in 2005, with about half this amount used in households for laundry bleaching and
disinfection. The other half was used primarily for wastewater and drinking water treatment;
other uses include pool sanitation, bleaching of pulp, paper, and textiles, and as an industrial
chemical. | [Definition]
ChEBI: An inorganic sodium salt in which hypochlorite is the counterion. | [Flammability and Explosibility]
Nonflammable | [Side effects]
Sodium hypochlorite, commonly known as bleach, may be used as a disinfectant solution. It is a strong irritant; however, isolated reports of CoU to sodium hypochlorite exist. The mechanism for the Cou is uncertain.
Hostynek et al. describe a 36-year-old woman who developed an intensely pruritic maculopapular rash to a hypochlorite-containing cleaning product that she spilled on her leg. The rash progressed to involve her trunk and extremities and was associated with teary eyes, dyspnea, and facial edema. There was a history of a previous sensitizing event, and open testing to 1% sodium hypochlorite produced an immediate urticarial reaction. The authors suggest that this could be due to an immunological mechanism given the generalized symptoms; however, no confirmatory testing was performed and the potential of sodium hypochlorite to cause nonimmunologic Cou was evident with four of 10 controls experiencing a wheal-and-flare reaction to open application of 6% sodium hypochlorite.
Caliskan et al. described a 32-year-old female who developed severe lip edema and breathing difficulty after using a sodium hypochlorite irrigation during endodontic treatment. A scratch test to sodium hypochlorite resulted in immediate erythema and edema that began to extend up the patient’s arm. She also had a history of breathing difficulties and had developed dermatitis from her hands to elbows with the use of household cleaning agents.
Neering reported on a patient who had experienced intermittent Cou to chlorinated pools and contact with a cleansing agent containing sodium hypochlorite. A scratch test to chlorinated water was strongly positive in this patient, but negative in five controls, and closed patch testing to sodium hypochlorite was strongly positive at three hours. |
| Questions and Answers (Q&A) | Back Directory | [Chemical Properties]
Anhydrous sodium hypochlorite explodes; the pentahydrate is a pale-green
870 SODIUM HYPOCHLORITEcrystalline solid; orthorhombic structure; density 1.6 g/cm3; melts at 18°C;
decomposed by CO2 in the air; soluble in water, 29.3 g/100 mL at 0°C; the
aqueous solution is highly stable. | [Uses]
Sodium hypochlorite is marketed only as an aqueous solution because
the anhydrous solid is highly unstable and can explode. The solid pentahydrate also is unstable in air, decomposed by reaction with carbon dioxide from
air. Aqueous solutions are very stable. They are used for bleaching textiles
and paper pulp; in cleaning solutions; in water purification; as a disinfectant
for swimming pools; and as a germicide and topical antiinfective. The
hypochlorite also is used as an oxidizing agent in many preparative reactions.
It is an ingredient of commercial bleaching products such as Clorox and
Dazzle. | [Preparation]
Sodium hypochlorite solution is obtained by passing chlorine into
sodium hydroxide solution. The pentahydrate is obtained by crystallization. | [Toxicity]
Skin contact with the solid hypochlorite pentahydrate or its concentrated solution can cause irritation. Ingestion may cause corrosion of mucous
membranes and gastric perforation. |
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