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127-09-3

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Identification

Name
Sodium acetate
CAS
127-09-3
Synonyms
ACETIC ACID NA-SALT
ACETIC ACID SODIUM SALT
BUFFER SOLUTION
FEMA 3024
MAGGRAN(R) NA
MAGNESIA 87844
NA ACETATE
SODIUM ACETATE
SODIUM ACETATE (1,2-12C2)
SODIUM ACETATE BUFFER
SODIUM ACETATE BUFFER SOLUTION
sodium ethanoate
acetatedesodium
Acetic acid sodium salt anhydrous
Anhydrous sodium acetate
anhydroussodiumacetate
femanumber3024
Natriumacetat
natriumaceticum
Niacet sodium acetate anhyd. tech
EINECS(EC#)
204-823-8
Molecular Formula
C2H3NaO2
MDL Number
MFCD00012459
Molecular Weight
82.03
MOL File
127-09-3.mol

Chemical Properties

Appearance
White powder
Melting point 
>300 °C (dec.)(lit.)

mp 
>300 °C (dec.)(lit.)

density 
1.01 g/mL at 20 °C

refractive index 
1.4640
FEMA 
3024
Fp 
>250 °C
storage temp. 
2-8°C

solubility 
H2O: 3 M at 20 °C, clear, colorless

form 
powder

color 
white

Specific Gravity
1.45
Stability:
Stable. Incompatible with strong oxidizing agents, halogens. Moisture sensitive.
Odor
Slight acetic acid
PH Range
8.5 - 9.9 at 246 g/l at 25 °C
PH
8.9 (25℃, 100mg/mL in water, 0.1 M agueous sodium acetate solution)
Water Solubility 
500 g/L (20 ºC)
Hydrolytic Sensitivity
0: forms stable aqueous solutions
Sensitive 
Hygroscopic
λmax
λ: 260 nm Amax: 0.03
λ: 280 nm Amax: 0.02
Merck 
14,8571
BRN 
3595639
Boiling point 
>400°C(decomposition)
InChIKey
VMHLLURERBWHNL-UHFFFAOYSA-M
Uses
This colorless crystal, also known as sodium ethanoate or acetate of soda, was made by the reaction of acetic acid with sodium carbonate. It is soluble in water but less so in alcohol. Sodium acetate was used as a pH modifier for toning baths.
Uses
Sodium Acetate is a source of acetic acid that is obtained as crystals or powder. it has a solubility of 1 g in 0.8 ml of water.
Uses
Sodium Acetate, Anhydrous is a source of acetic acid obtained as a granular powder. it has a solubility of 1 g in 2 ml of water.
CAS DataBase Reference
127-09-3(CAS DataBase Reference)
NIST Chemistry Reference
Sodium ethanoate(127-09-3)
EPA Substance Registry System
127-09-3(EPA Substance)

Safety Data

Safety Statements 
S22:Do not breathe dust .
S24/25:Avoid contact with skin and eyes .
WGK Germany 
1

RTECS 
AJ4300010


3
Autoignition Temperature
607 °C
TSCA 
Yes
HS Code 
29152200
Safety Profile
Poison by intravenous route. Moderately toxic by ingestion. A skin and eye irritant. Migrates to food from packagmg materials. Violent reaction with F2, m03, diketene. When heated to decomposition it emits toxic fumes of Na2O.
Hazardous Substances Data
127-09-3(Hazardous Substances Data)
Toxicity
LD50 orally in Rabbit: 3530 mg/kg LD50 dermal Rabbit > 10000 mg/kg

Raw materials And Preparation Products

Material Safety Data Sheet(MSDS)

Questions and Answers (Q&A)

Description
Sodium acetate (CH3COONa) is the sodium salt of acetic acid. It appears as a colorless deliquescent salt with a wide range of applications. In industry, it can be used in textile industry to neutralize sulfuric acid waste streams and as a photoresist upon using aniline dyes. In concrete industry, it can be used as a concrete sealant to mitigate the water damage. In food, it can be used as a seasoning. It can also be used as a buffer solution in lab. In addition, it is also used in heating pads, hand warmers and hot ice. For laboratory use, it can be produced by the reaction between acetate with the sodium carbonate, sodium bicarbonate and sodium hydroxide. In industry, it is prepared from the glacial acetic acid and sodium hydroxide.
Chemical Properties
Sodium acetate, NaC2H302, is a colorless,efflorescent crystal,soluble in water and ether.Its melting point is 324°C.
The anhydrous salt is hygroscopic and forms with water a trihydrate, CH3COONa·3H20 which loses its water of crystallization completely at 3%K. What is left is the anhydrous salt as a white flaky powder.It dissolves easily in water with temperature reduction and is virtually completely hydrolyzed in water. The solution shows slightly alkaline reaction.
Sodium acetate is prepared by neutralizing aceticacid with sodium hydroxide. The trihydrate crystallizes from the solution below 58°C, The anhydrous salt is prepared by crystallization above 58°C and drying in vacuo. The hydrate is used because it is cheaper and dissolves rapidly in water,
Uses
Sodium acetate is the most-used alkali metal acetate, The largest amounts are used in medicine as an electrolyte for artificial kidneys and for artificial feeding.It is employed as a buffer substance and corrosion inhibitor, An hydrous sodium acetate,in organic chemistry, is a mildde hydrating agent and a catalyst,for example in the synthesis of cinnamic acid from benzalde hydeand acetic acid. Other fields of application are in the textile industry(dyeing of wool), the tanneries,food preservation, the photographic industry.
Reactivity Profile
When sodium acetate reacts with strong acids, irritating, noxious vapors of acetic acid are usually produced. Sodium acetate is sufficiently basic to catalyze the violent polymerization of diketene, perhaps as well as other reactive dimers that are susceptible to polymerization in the presence of a mild base.
Preparation
Sodium acetate is prepared by reacting sodium hydroxide or sodium carbonate with acetic acid in aqueous solution. The solution is evaporated to obtain hydrated crystals of sodium acetate.
NaOH + CH3COOH → CH3COONa + H2O
Na2CO3 + CH3COOH → 2CH3COONa + CO2 + H2O

Hazard Information

Physical properties
Anhydrous salt is a colorless crystalline solid; density 1.528 g/cm3; melts at 324°C; very soluble in water; moderately soluble in ethanol. The colorless crystalline trihydrate has a density 1.45 g/cm3; decomposes at 58°C; is very soluble in water; pH of 0.1M aqueous solution is 8.9; moderately soluble in ethanol, 5.3 g/100mL.
Occurrence
Acetic acid or acetates are present in most plant and animal tissues in small, but detectable amounts
Application
2 - 1 - Industrial
Sodium acetate is used in the textile industry to neutralize sulfuric acid waste streams, and as a photoresist while using aniline dyes. It is also a pickling agent in chrome tanning, and it helps to retard vulcanization of chloroprene in synthetic rubber production. In processing cotton for disposable cotton pads, sodium acetate is used to eliminate the buildup of static electricity.
2 - 2 - Concrete longevity
Sodium acetate is used to reduce the damage water can potentially do to concrete by acting as a concrete sealant, while also being environmentally benign and cheaper than the epoxy alternative that is usually employed for sealing concrete against water permeation.
2 - 3 - Food
Sodium acetate may be added to foods as a seasoning. It may be used in the form of sodium diacetate — a 1:1 complex of sodium acetate and acetic acid, given the E-number E262. A frequent use is to impart a salt and vinegar flavor to potato chips.
2 - 4 - Buffer solution
As the conjugate base of acetic acid, a solution of sodium acetate and acetic acid can act as a buffer to keep a relatively constant pH.
2 - 5 - Heating pad
Sodium acetate is also used in consumer heating pads or hand warmers and is also used in hot ice. Sodium acetate trihydrate crystals melt at 58.4°C , (to 58°C ) dissolving in their water of crystallization. When they are heated to around 100°C, and subsequently allowed to cool, the aqueous solution becomes supersaturated. This solution is capable of cooling to room temperature with out forming crystals.
Definition
A white solid prepared by the neutralization of ethanoic acid with either sodium carbonate or sodium hydroxide. Sodium ethanoate reacts with sulfuric acid to form sodium hydrogensulfate and ethanoic acid; with sodium hydroxide it gives rise to sodium carbonate and methane. Sodium ethanoate is used in the dyeing industry.
Reactions
Sodium acetate can be used to form an ester with an alkyl halide such as bromo ethane:
CH3COONa + Br CH2CH3→ CH3COOCH2CH3+ NaBr
Caesium salts catalyze this reaction.
General Description
Sodium Acetate is reported to inhibit the growth of Listeria monocytogenes.

Biological Activity
Commonly used laboratory reagent
Chemical Synthesis
Acetic acid plus sodium bicarbonate makes sodium acetate plus carbonic acid. Produced by the neutralization of acetic acid with sodium bicarbonate, or by treating calcium acetate with sodium sulfate and sodium bicarbonate.
Purification Methods
Crystallise it from acetic acid and keep it under vacuum for 10hours at 120o. Alternatively, it is crystallised from aqueous EtOH, as the trihydrate. This material can be converted to anhydrous salt by heating slowly in a porcelain, nickel or iron dish, so that the salt liquefies. Steam is evolved and the mass again solidifies. Heating is now increased so that the salt melts again. (NB: if it is heated too strongly, the salt can char; avoid this.) After several minutes, the salt is allowed to solidify and is cooled to a convenient temperature (in a desiccator) before being powdered and bottled. The water content should now be less than 0.02%. [Beilstein 2 II 113, 2 III 184, 2 IV 109.]

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