murphyPotassium Carbonate
AKA: 584-08-7, Dipotassium carbonate, Carbonate of potash, Anhydrous, Carbonic acid, Dipotassium salt, Pearl ash, Salt of tartar, Kaliumcarbonat, Kalium carbonicum
Synthetic
Clean
OriginPotassium carbonate is derived from potassium salts and carbon dioxide, members of the alkali metal carbonate chemical family. It is synthesized by reacting potassium hydroxide or potassium chloride with carbon dioxide or carbonate sources.
Potassium carbonate (K2CO3) is a white salt, soluble in water (insoluble in ethanol) which forms a strongly alkaline solution. It can be made as the product of potassium hydroxide's absorbent reaction with carbon dioxide. It presents a large capacity to absorb moisture.
Solubility Very soluble in water. Insoluble in ethanol
Formula
CK2O3
Mol. Weight
138.21
CAS #
584-08-7
Form
Powder
State
NKRA; Dry Powder, Liquid; Pellets or Large Crystals; Liquid; Dry Powder; Water or Solvent Wet Solid; Other Solid
Skin Types
●all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Yes
Functions
Buffering
Stabilizes pH
Antioxidant Protection
Reduces Inflammation
Locks In Moisture
The paper trail
🔬Peer-reviewed1 paper →
⚖️Regulatory1 listing →
🛡️Safety-assessed2 reviews →
Counts, not a verdict. A listing isn't a study. The trail, you decide.
EWG
1
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
Not a Sensitizer
1 study / 1 not sensitizing / plus 1 case report (CIR 722)
Skin Irritant in Testing (CIR report on the ingredient group)
CIR report statement covering this group of ingredients / not tested individually (CIR 722)
Concentration Guide
Leave-on0.002–0.0068%
Rinse-off0.0019–2.5%
0%50%100%
CIR reported use · 2015 survey
Regulatory Agencies
Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR