Molekula
Potassium phosphate tribasic 98.9%
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 2000 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
Potassium phosphate tribasic (K3PO4, CAS 7778-53-2) is a water-soluble inorganic salt used as a buffering agent, nutrient supplement in fertilizers, and pH regulator in food, pharmaceuticals, and industrial processes. It appears as a white, hygroscopic powder with a molecular weight of 212.27 g/mol. Store at ambient conditions. Signal word: Danger. Molekula supplies potassium phosphate tribasic from research to bulk quantities with full documentation and ISO 9001:2015 traceability.
Example image for illustration only. Other packaging and pack sizes are available.
Pricing & pack sizes
Pack sizes & pricing
Pricing on request — packs available from research to bulk quantities.
Need a different quantity or pack?
Tell us how much you need and when — drums, IBCs, sacks or a one-off bulk lot. We'll manufacture or source it and come back with a price.
Prices exclude VAT/sales tax and shipping.
Specifications
| Property | Value |
|---|---|
| Appearance | Hygroscopic white powder without foreign matters. |
| Identification | Positive tests for potassium and phosphate |
| Loss on Ignition | ≤3.0% |
| Solubility | 94 g/100g water @ 20°C |
| Assay | ≥97% |
| Insoluble Matter | ≤0.20% |
| Bulk density | 0.60-1.00 g/cm3 |
| P2O5 | 33.0-34.0% |
| Whiteness | ≥95.0% |
| Heavy Metals (Pb) | ≤ 10ppm |
| K2O | 66.5% |
| Granulometry | Cumulated retain on : 800um ≤15% |
| Cadmium (Cd) | ≤1.0% |
| Lead (Pb) | ≤1.0% |
| Mercury (Hg) | ≤0.1ppm |
| Arsenic (As) | ≤1.0% |
| Fluoride (F-) | ≤10.0ppm |
| pH (1% sol.) | 11.7-12.3 |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Acidity | Base |
Literature values
Published physical properties of the substance, not batch specifications.
| Property | Value |
|---|---|
| Solubility (other solvents) | Freely soluble in water. Insoluble in ethanol |
Source: PubChem CID 62657 (EU Food Improvement Agents)
Identification
| Property | Value |
|---|---|
| SKU | 90033537 |
| CAS Number | 7778-53-2 |
| IUPAC Name | tripotassium;phosphate |
| EC Number | 231-907-1 |
| Molecular Formula | K3PO4 |
| Molecular Weight | 212.27 |
| Exact Mass | 211.8445 |
| SMILES | [O-]P(=O)([O-])[O-].[K+].[K+].[K+] |
| InChIKey | LWIHDJKSTIGBAC-UHFFFAOYSA-K |
| InChI | InChI=1S/3K.H3O4P/c;;;1-5(2,3)4/h;;;(H3,1,2,3,4)/q3*+1;/p-3 |
| PubChem CID | 62657 |
| REACH Code | Y110 |
| TSCA Listed | Yes |
| HTS Code | 28352400 |
| Tariff Code | 2835240000 |
Safety & GHS
-
Corrosive
GHS05
-
Health Hazard
GHS07
Hazard statements
- H315 Causes skin irritation
- H318 Causes serious eye damage
- H335 May cause respiratory irritation
Precautionary statements
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P302+352 IF ON SKIN: Wash with soap and water
- P304+340 IF INHALED: Remove victim to fresh air and keep at rest in a position comfortable for breathing
- P305+351+338 IF IN EYES: Rinse with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing
- P333+313 IF skin irritation or a rash occurs: Get medical advice/attention
- P337+313 If eye irritation persists get medical advice/attention
Documents
Safety Data Sheets (SDS)
Available in English, English (US), French, German, Italian, Spanish.
Certificate of Analysis (CoA) by batch
Enter a lot or batch number to retrieve the CoA for that specific batch. We can generate one from spec data if no PDF is on file.
Synonyms
- Caswell No. 700A
- EPA Pesticide Chemical Code 076407
- Phosphoric acid potassium salt (1:3)
- Phosphoric acid, tripotassium salt
- Potassium orthophosphate
- Potassium pentahydrogen bis(phosphate)
- Potassium phosphate (K3PO4)
- tribasic potassium phosphate
- Tripotassium orthophosphate
- Tripotassium phosphate
Frequently asked questions
What is potassium phosphate tribasic (K₃PO₄) commonly used for?
Potassium phosphate tribasic is primarily used as a fertilizer, food additive (e.g., E340iii), pH buffer in industrial processes, and a nutrient in cell culture media.
What is the molecular formula and molecular weight of potassium phosphate tribasic?
The molecular formula is K₃PO₄, and the molecular weight is 212.27 g/mol.
How should potassium phosphate tribasic be stored?
Store in a cool, dry place at ambient temperature, away from moisture and incompatible substances. Ensure containers are tightly sealed.
What purity grade is available for potassium phosphate tribasic from Molekula?
Molekula supplies potassium phosphate tribasic at a 98.9% purity grade as standard.
Can Molekula supply potassium phosphate tribasic in bulk quantities?
Yes, Molekula can provide potassium phosphate tribasic in bulk quantities—please contact us for specific packaging options and minimum order quantities.
What documentation is provided with an order of potassium phosphate tribasic?
Each order includes a Certificate of Analysis (CoA), Material Safety Data Sheet (MSDS), and a product specification sheet. Additional documentation (e.g., batch-specific reports) may be available upon request.
Ready to order or need a custom pack?
Tell us the product, grade, and quantity — Molekula usually responds within one working day with pricing and lead time.