Potassium acetate
CAS Number
127-08-2
EC Number
204-822-2
Abbreviation
KOAc
What is Potassium acetate?
Potassium acetate (CAS 127-08-2), also known by the E-number E261, is an acetate salt used as a pH buffer, preservative, and processing catalyst.
Where is Potassium acetate used?
- Food: acidity regulator and preservative in pickled products, sauces, and processed foods
- Pharmaceuticals: buffering agent in injectable solutions, oral liquids, and dialysis fluids
- Personal care: pH regulator in creams, lotions, and hair care products
- Industrial and laboratory: catalyst in organic synthesis
- It also serves as a desiccant in certain chemical processes.
Good to know: It offers a potassium-based alternative for sodium-restricted formulations, delivering precise acidity control where sodium-based alternatives are unsuitable.
Commercial specifications
- Food-grade (FCC), USP, BP, and Ph. Eur. grades
- High purity for sensitive manufacturing
Other Names (Synonyms)
MeCO2K|KOAc|CH3CO2K|AcOK|E261|Diuretic salt|ACETIC ACID, POTASSIUM SALT|Acetic acid, potassium salt (1:1)
What are the physical properties of Potassium acetate?
Melting Point 292 °C
Density 1.57 g/cm³ @ Temp: 25 °C
Flash Point >250°C
Appearance colourless crystals or white powder
Color White to light brown
Odor Odorless
Form Solid
Water Solubility 2694 g/L (25 ºC)
Vapor Pressure <0.0000001 hPa ( 25 °C)
Refractive Index n 20/D 1.370
pH 7.5-8.5 (50g/l, H2O, 20℃)
Log P -3.72
How is Potassium acetate classified and handled safely? Learn More
Warning
GHS07· Irritant
Hazard Statements
H315 Causes skin irritation
H319 Causes serious eye irritation
H335 May cause respiratory irritation
Precautionary Statements
P261 Avoid breathing dust/fume/gas/mist/vapours/spray.
P264 Wash … thoroughly after handling.
P271 Use only outdoors or in a well-ventilated area.
P280 Wear protective gloves/protective clothing/eye protection/face protection.
Which trade and regulatory codes apply to Potassium acetate?
HS Code 29159000
Storage Class 13 - Non Combustible Solids
WGK (Germany) 1