Molekula
Potassium dihydrogen phosphate
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 dihydrogen phosphate (KH₂PO₄) is a water-soluble inorganic salt widely used as a buffering agent in biochemical research, a nutrient in cell culture media, and a pH regulator in food and pharmaceutical applications. It also functions as a fertilizer and flame retardant. This chemical has a CAS number of 7778-77-0, a molecular formula of KH₂PO₄, and a molecular weight of 136.08 g/mol. It is stored at ambient conditions but requires careful handling due to its "Danger" classification. Molekula supplies potassium dihydrogen phosphate 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
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.
-
500 g — £30.00 per pack ex VAT · £36.00 inc. VAT
-
1 kg — £48.00 per pack ex VAT · £57.60 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 | Colourless crystals or powder |
| Assay/Purity | ≥99.0% |
| pH | (50g/L, 25℃) 4.2 - 4.5 |
| Loss on Drying | ≤0.2% |
| Chloride (Cl-) | ≤0.001% |
| Clarity | Pass |
| Heavy Metals (Pb) | ≤0.001% |
| Water insoluble matter | ≤0.002% |
| Iron (Fe) | ≤0.001% |
| Arsenic (As) | ≤0.0005% |
| Sodium (Na) | ≤0.02% |
| Sulphates (SO4)(2-) | ≤0.003% |
| Nitrogen (N) | ≤0.001% |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Transport Class | 6.1 |
| Packing Group | III |
| Acidity | Acid |
Literature values
Published physical properties of the substance, not batch specifications.
| Property | Value |
|---|---|
| Appearance | White tetragonal crystals |
| Odour | Odorless |
| Melting Point | 253 °C |
| Density | 2.34 g/cm³ |
| Solubility (other solvents) | Soluble in about 4.5 parts water; insoluble in alcohol |
| Refractive Index | 1.5093 |
Source: PubChem CID 516951 (HSDB)
Identification
| Property | Value |
|---|---|
| SKU | 90038275 |
| CAS Number | 7778-77-0 |
| IUPAC Name | potassium dihydrogen phosphate |
| EC Number | 231-913-4 |
| Molecular Formula | KH2PO4 |
| Molecular Weight | 136.08 |
| Exact Mass | 135.9328 |
| SMILES | OP(=O)(O)[O-].[K+] |
| InChIKey | GNSKLFRGEWLPPA-UHFFFAOYSA-M |
| InChI | InChI=1S/K.H3O4P/c;1-5(2,3)4/h;(H3,1,2,3,4)/q+1;/p-1 |
| PubChem CID | 516951 |
| UN Number | UN3288 |
| REACH Code | Y110 |
| TSCA Listed | Yes |
| HTS Code | 2835.24.0000 |
| Tariff Code | 2835240000 |
Safety & GHS
-
Toxic
GHS06
Hazard statements
- H302 Harmful if swallowed
- H331 Toxic if inhaled
Precautionary statements
- P260 Do not breathe dust/fume/gas/mist/vapours/spray
- P271 Use only outdoors or in a well-ventilated area
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P284 Wear respiratory protection
- P301+330 IF SWALLOWED: Rinse mouth. Do NOT induce vomiting
- P304+340 IF INHALED: Remove victim to fresh air and keep at rest in a position comfortable for breathing
Documents
Safety Data Sheets (SDS)
Available in English, French, German, Italian, Portuguese, 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
- Monobasic potassium phosphate
- Monopotassium dihydrogen phosphate
- Monopotassium monophosphate
- Monopotassium orthophosphate
- MONOPOTASSIUM PHOSPHATE
- Phosphoric acid, monopotassium salt
- Potassium acid phosphate
- potassium biphosphate
- Potassium dihydrogen orthophosphate
- Potassium phosphate monobasic
Frequently asked questions
What is potassium dihydrogen phosphate (KH₂PO₄) commonly used for?
Potassium dihydrogen phosphate is primarily used as a buffer in biochemical and molecular biology applications, a nutrient in fertilizers, and in food additives (e.g., acidulant, leavening agent). It is also used in flame retardants and as a pH regulator in industrial processes.
What is the molecular formula and molecular weight of potassium dihydrogen phosphate?
The molecular formula is KH₂PO₄, and the molecular weight is 136.08 g/mol.
What safety classification does potassium dihydrogen phosphate fall under?
Potassium dihydrogen phosphate is classified with the Signal Word: Danger due to its potential hazards, including H302 (harmful if swallowed) and H331 (toxic if inhaled). Always refer to the full SDS for handling precautions.
What grades of potassium dihydrogen phosphate does Molekula supply?
Molekula supplies analytical grade (ACS/Reagent grade) potassium dihydrogen phosphate for research and industrial applications. Bulk and custom grades may be available upon request.
Can Molekula supply potassium dihydrogen phosphate in bulk quantities?
Yes, Molekula can supply potassium dihydrogen phosphate in bulk quantities, with packaging options tailored to your requirements (e.g., drums, bags, or custom containers). Contact our sales team for bulk pricing and logistics details.
What documentation comes with an order of potassium dihydrogen phosphate?
Each order includes a Certificate of Analysis (CoA), Material Safety Data Sheet (SDS), and a packing list. For bulk orders, additional documentation such as a Batch Analysis Report may be provided 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.