Molekula
Potassium dihydrogen phosphate (Monobasic)
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 dihydrogen phosphate (monobasic) is a white crystalline powder used as a buffer in biochemical applications and a source of potassium and phosphorus in fertilizers and food additives. It has a CAS number of 7778-77-0, molecular formula KH2PO4, and a molecular weight of 136.08 g/mol. Store at ambient temperatures. Signal word: Danger. Molekula supplies Potassium dihydrogen phosphate (monobasic) 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.
Often bought together
Pricing & pack sizes
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 — £15.00 per pack ex VAT · £18.00 inc. VAT
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500 g — £25.00 per pack ex VAT · £30.00 inc. VAT
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1 kg — £42.00 per pack ex VAT · £50.40 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 powder, hygroscopic |
| Identification | Conforms |
| pH | 4.2 ~ 4.7 |
| Loss on Drying | ≤1.0% (4hrs, 105°C) |
| Assay | ≥98.0% |
| P2O5 | ≥ 51.2% |
| Water insoluble matter | ≤ 0.2% |
| Fluorine (F) | ≤10.0ppm |
| Cadmium (Cd) | ≤1.0ppm |
| Lead (Pb) | ≤1.0ppm |
| Mercury (Hg) | ≤1.0ppm |
| Arsenic (As) | ≤1.0ppm |
| Potassium Oxide | ≥ 33.5% |
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 | 42899676 |
| 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
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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.
Synonyms
No alternate names recorded for this product.
Frequently asked questions
What is potassium dihydrogen phosphate used for?
It is commonly used as a buffer in biological and biochemical applications, in fertilizers, and as a reagent in analytical chemistry.
What is the chemical formula and molecular weight?
The formula is KH2PO4 and the molecular weight is 136.08 g/mol.
How should potassium dihydrogen phosphate be stored?
It should be stored at ambient temperature, protected from moisture and heat.
What grade is available?
Available in reagent grade and higher purity grades suitable for laboratory and industrial use.
Can Molekula supply it in bulk?
Yes, Molekula can supply potassium dihydrogen phosphate in bulk quantities upon request.
What documentation comes with the order?
Each order includes a Certificate of Analysis and Safety Data Sheet (SDS) with the shipment.
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.