Molekula
Hach Lange™ Free Chlorine Reagent Powder Pillows - Hach Lange™ 2105569
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
Hach Lange™ Free Chlorine Reagent Powder Pillows (CAS 7558-79-4) are sodium phosphate-based analytical reagents designed for precise measurement of free chlorine in water treatment and environmental testing. The powder pillows provide accurate, on-site quantification with minimal preparation. Catalogue details: molecular formula Na2PO4H, molecular weight 141.96 g/mol, stable at ambient storage, no safety signal word required. Molekula supplies Hach Lange™ Free Chlorine Reagent Powder Pillows 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
Pack sizes & pricing
Pricing on request — packs available from research to bulk quantities.
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Prices exclude VAT/sales tax and shipping.
Specifications
Specifications available on request — see Documents below or contact our sales team.
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Acidity | Base |
Literature values
Published physical properties of the substance, not batch specifications.
| Property | Value |
|---|---|
| Appearance | White, hygroscopic powder |
| Odour | None |
| Solubility (other solvents) | Freely soluble in water. Insoluble in ethanol |
| Refractive Index | 1.463 |
| pKa | pKa1 = 2.15 |
Source: PubChem CID 24203 (HSDB, EU Food Improvement Agents)
Identification
| Property | Value |
|---|---|
| SKU | 90034206 |
| CAS Number | 7558-79-4 |
| IUPAC Name | disodium;hydrogen phosphate |
| EC Number | 231-448-7 |
| Molecular Formula | Na2PO4H |
| Molecular Weight | 141.96 |
| Exact Mass | 141.9408 |
| SMILES | OP(=O)([O-])[O-].[Na+].[Na+] |
| InChIKey | BNIILDVGGAEEIG-UHFFFAOYSA-L |
| InChI | InChI=1S/2Na.H3O4P/c;;1-5(2,3)4/h;;(H3,1,2,3,4)/q2*+1;/p-2 |
| PubChem CID | 24203 |
| REACH Code | Y113 |
| TSCA Listed | Yes |
| HTS Code | 28352200 |
| Tariff Code | 2835220000 |
Safety & GHS
Precautionary statements
- P264 Wash thoroughly after handling
- P280 Wear protective gloves/protective clothing/eye protection/face protection
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 Hach Lange™ Free Chlorine Reagent Powder Pillows (2105569) used for?
This product is used for accurate and convenient testing of free chlorine levels in water samples, typically in drinking water, swimming pools, and wastewater treatment applications.
What is the chemical formula and molecular weight of this reagent?
The formula is Na₂PO₄H (disodium hydrogen phosphate, also known as sodium phosphate dibasic), with a molecular weight of 141.96 g/mol (CAS: 7558-79-4).
How should this reagent be stored?
Store at ambient temperature in a dry, well-ventilated area, away from moisture and direct sunlight.
What grade or purity level is available for this product?
This is a reagent-grade product, specifically formulated for analytical testing by Hach Lange™.
Can Molekula supply this product in bulk quantities?
Molekula can provide bulk quantities of this reagent upon request, depending on availability and order specifications.
What documentation comes with an order of this product?
Each order includes a Certificate of Analysis (CoA), Material Safety Data Sheet (MSDS), and Product Information Sheet for compliance and usage guidance.
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.