Molekula
Potassium phosphate tribasic
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 1999 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
Potassium phosphate tribasic is a water-soluble inorganic salt used as a buffer, pH adjuster, and reagent in biochemical and pharmaceutical applications. It is supplied with an assay of ≥ 97% (on dried basis), a molecular weight of 212.27 g/mol and a CAS number of 7778-53-2. Stored at ambient temperatures, it is classified as a hazardous substance with a signal word of Danger.
Molekula supplies Potassium phosphate tribasic at ≥ 97% (on dried basis) purity in 100 g and 1 kg packs, from £31.68 inc. VAT. It is in stock for same-day dispatch. Every batch ships with a certificate of analysis, and safety data sheets are available in 5 languages. Larger quantities, up to multi-tonne, are quoted on request.
Example image for illustration only. Other packaging and pack sizes are available.
Pricing & pack sizes
In stock — same-day dispatch
These pack sizes aren't a limit. Molekula manufactures, sources and repacks to order — if you need 500 kg and only see 1 kg listed, . We quote from grams to multi-tonne.
Need a different size? Add the nearest pack and change the size in your basket — we price it at the same rate per unit.
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100 g — £26.40 per pack ex VAT · £31.68 inc. VAT
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1 kg — £71.30 per pack ex VAT · £85.56 inc. VAT
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 | White to off-white powder |
| Heavy metals | ≤ 10mg/kg |
| pH | 11.5 - 12.5 |
| Loss on Drying | ≤ 5.0% |
| Assay | ≥ 97% (on dried basis) |
| Water insoluble matter | ≤ 0.2% |
| Lead (Pb) | ≤ 2.0mg/kg |
| Arsenic (As) | ≤ 3.0mg/kg |
| Fluoride (F-) | ≤ 10.0mg/kg |
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 | 90018476 |
| 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
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Corrosive
GHS05
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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, 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.
Quality certificates
Molekula Group is certified to ISO 9001:2015 (quality) and ISO 14001:2015 (environmental management), audited by a UKAS-accredited body. Both certificates are valid to 17 May 2028.
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 used for?
It is commonly used as a buffering agent in biochemical applications and in the formulation of fertilizers and food additives.
What is the chemical formula and molecular weight of potassium phosphate tribasic?
The formula is K3PO4 and the molecular weight is 212.27 g/mol.
How should potassium phosphate tribasic be stored?
It should be stored at ambient temperature, protected from moisture and light.
What grade is available for potassium phosphate tribasic?
The product is specified as a white to off-white powder with an assay of ≥ 97% (on dried basis), with limits including heavy metals ≤ 10 mg/kg, lead ≤ 2.0 mg/kg, arsenic ≤ 3.0 mg/kg and fluoride ≤ 10.0 mg/kg.
Can Molekula supply potassium phosphate tribasic in bulk?
Yes, Molekula offers bulk quantities for industrial and large-scale applications.
What documentation comes with an order of potassium phosphate tribasic?
Each order includes a Certificate of Analysis (CoA) and Safety Data Sheet (SDS) upon request.
Where can I buy Potassium phosphate tribasic?
Directly from Molekula, which lists Potassium phosphate tribasic in 100 g and 1 kg packs from £31.68 inc. VAT, with a certificate of analysis for every batch. Larger quantities are quoted on request. Molekula's offices: United Kingdom, France, Spain, Germany, Italy, United States and China.
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.