Molekula
Sodium phosphate, dibasic heptahydrate USP Grade
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
Sodium phosphate, dibasic heptahydrate USP Grade is a water-soluble sodium salt of phosphoric acid, widely used in pharmaceuticals, food processing as a buffering agent, and in laboratory applications for pH adjustment and nutrient media preparation. It also serves as a mordant in textile dyeing, in leather tanning, and in making ceramics, enamels and detergents. It meets USP standards for purity and consistency in critical applications. CAS 7782-85-6, molecular formula PO4HNa2·7H2O, molecular weight 268.07 g/mol. Stored at ambient conditions. Signal word: Warning. Molekula supplies Sodium phosphate, dibasic heptahydrate USP Grade 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
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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1 kg — £85.50 per pack ex VAT · £102.60 inc. VAT
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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.
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Specifications
| Property | Value |
|---|---|
| Appearance | White crystalline powder |
| Loss on Drying | 43 - 50% |
| Chloride (Cl-) | Max 0.06% |
| Assay | 98 - 100.5% |
| Insoluble Matter | Max 0.4% |
| Heavy Metals (Pb) | Max 0.002% |
| Arsenic (As) | Max 16ppm |
| Sulphates (SO4)(2-) | Max 0.2% |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Acidity | Base |
Identification
| Property | Value |
|---|---|
| SKU | 90027809 |
| CAS Number | 7782-85-6 |
| IUPAC Name | disodium;hydrogen phosphate;heptahydrate |
| Molecular Formula | PO4HNa2 · 7H2O |
| Molecular Weight | 268.07 |
| Exact Mass | 268.0147 |
| SMILES | O.O.O.O.O.O.O.OP(=O)([O-])[O-].[Na+].[Na+] |
| InChIKey | PYLIXCKOHOHGKQ-UHFFFAOYSA-L |
| InChI | InChI=1S/2Na.H3O4P.7H2O/c;;1-5(2,3)4;;;;;;;/h;;(H3,1,2,3,4);7*1H2/q2*+1;;;;;;;;/p-2 |
| PubChem CID | 6096963 |
| REACH Code | Y113 |
| HTS Code | 2835220000 |
| Tariff Code | 2835220000 |
Safety & GHS
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Health Hazard
GHS07
Hazard statements
- H315 Causes skin irritation
- H319 Causes serious eye irritation
Precautionary statements
- P261 Avoid breathing dust/fume/gas/mist/vapours/spray
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P302+352 IF ON SKIN: Wash with soap and water
- P305+351+338 IF IN EYES: Rinse with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing
- P337+313 If eye irritation persists get medical advice/attention
Documents
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
- DIBASIC SODIUM PHOSPHATE HEPTAHYDRATE
- Disodium phosphate heptahydrate
- disodium;hydrogen phosphate;heptahydrate
- H15Na2O11P
- heptahydratedibasicsodium phosphate
- Phosphoric acid, disodium salt, heptahydrate
- Sodium hydrogen phosphate heptahydrate
- Sodium monohydrogen phosphate heptahydrate (2:1:1:7)
- Sodium phosphate dibasic heptahydrate
- Sodium phosphate, diabasic, heptahydrate
Frequently asked questions
What is sodium phosphate, dibasic heptahydrate USP grade commonly used for?
It is primarily used as a buffering agent in pharmaceuticals, food processing (e.g., emulsifier/stabilizer), and laboratory applications for pH adjustment.
What is the chemical formula and molecular weight of sodium phosphate, dibasic heptahydrate?
The formula is **PO₄HNa₂·7H₂O**, and the molecular weight is **268.07 g/mol**.
How should sodium phosphate, dibasic heptahydrate USP be stored?
Store in a tightly sealed container at **ambient temperature**, away from moisture and incompatible substances.
Does Molekula offer this product in bulk quantities?
Yes, we supply sodium phosphate, dibasic heptahydrate USP in bulk, with quantities tailored to your requirements.
What documentation is provided with an order of this product?
Each order includes a **Certificate of Analysis (CoA)**, **Material Safety Data Sheet (MSDS)**, and **USP compliance documentation**.
Ready to order or need a custom pack?
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