Molekula
Sodium phosphate, dibasic heptahydrate
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 is a water-soluble inorganic compound used as a buffer, stabilizer, and pH adjuster in pharmaceuticals, food, and laboratory applications. Industrially, it also serves as a mordant in textile dyeing and is used in leather tanning, fireproofing, and the manufacture of detergents and ceramics. It appears as colorless crystals or white powder. CAS: 7782-85-6, Molecular formula: PO4HNa2 · 7H2O, Molecular weight: 268.07 g/mol, Storage: Ambient, Signal word: Warning. Molekula supplies Sodium phosphate, dibasic heptahydrate 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 — $82.70 per pack
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 crystalline powder |
| Heavy metals | ≤ 10ppm |
| pH | 8.7 - 9.3 (5% aq.) |
| Loss on Drying | 45.0 - 50.0 % |
| Chlorides | ≤ 0.02% |
| Water insoluble matter | ≤ 0.4% |
| Assay (Anhydrous) | ≥ 98.0% |
| Arsenic (As) | ≤ 0.0003% |
| Sulphates (SO4)(2-) | ≤ 0.05% |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Acidity | Base |
Identification
| Property | Value |
|---|---|
| SKU | 16988231 |
| 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
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
- DIBASIC SODIUM PHOSPHATE HEPTAHYDRATE
- Disodium phosphate heptahydrate
- disodium;hydrogen phosphate;heptahydrate
- H15Na2O11P
- heptahydratedibasicsodium phosphate
- Phosphoric acid, disodium salt, heptahydrate
- Sodium hydrogen phosphate heptahydrate
- Sodium hydrogen phosphate--water (2/1/7)
- Sodium monohydrogen phosphate heptahydrate (2:1:1:7)
- Sodium phosphate, diabasic, heptahydrate
Frequently asked questions
What is sodium phosphate, dibasic heptahydrate used for?
It is commonly used as a buffer in biochemical applications and in food processing as a pH regulator and emulsifier.
What is the chemical formula and molecular weight?
The formula is PO4HNa2 · 7H2O with a molecular weight of 268.07 g/mol.
How should sodium phosphate, dibasic heptahydrate be stored?
Store at ambient temperature, protected from moisture and heat.
What grade is available?
Available in reagent grade; other grades may be available upon request.
Can Molekula supply it in bulk?
Yes, bulk quantities are available—please contact our sales team for pricing and availability.
What documentation comes with the order?
Each order includes a Certificate of Analysis (CoA); additional documentation such as SDS is 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.