Product Overview
Trisodium Phosphate Dodecahydrate (Na3PO4·12H2O) is a white, free-flowing dry powder sold here at ACS Reagent grade — the purity tier accepted for analytical and laboratory work. It dissolves readily in water to produce a strongly alkaline solution, which is exactly why it shows up in buffering systems, degreasing baths, and water-treatment dosing. If your process demands a phosphate salt with documented purity and traceable lot data, this is the form to specify.
we distribute this product in sizes from 2 lb jars through 50 lb pails, packed and shipped daily from our warehouse in Taylor, TX. Every unit leaves with an SDS, and lot-specific Certificates of Analysis are available on request.
Why This Grade and Hydration Form
ACS Reagent grade means the material meets the purity specifications published by the American Chemical Society for laboratory reagent use. For a QC lab running phosphate standards or a research bench preparing buffer solutions, that designation matters — it tells you the impurity profile has been tested to a published spec, and the assay is consistent lot to lot.
The dodecahydrate form (twelve waters of crystallization per formula unit) is the most common commercial form of trisodium phosphate. It dissolves faster than the anhydrous salt and is easier to weigh and handle as a free-flowing powder. The trade-off: because roughly half the molecular weight is water of hydration, you need about twice the mass per mole of active phosphate compared to anhydrous TSP. Factor that into your dosing calculations.
If your application is industrial cleaning or water treatment and does not require ACS-level purity documentation, a technical grade would cost less per pound. But if your SOP calls for a reagent-grade phosphate salt — or if you need a COA with each lot — this is the correct pick.
Chemical Profile
Trisodium Phosphate Dodecahydrate has the molecular formula H24Na3O16P and a molecular weight of 380.12 g/mol. The CAS registry number is 10101-89-0. In the container, the product is a dry white powder that is soluble in water. The high water of hydration gives the crystal structure its characteristic free-flowing behavior and relatively fast dissolution rate compared to anhydrous phosphate salts.
Industrial Applications
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pH Buffering and Adjustment. Dissolved in water, TSP produces a strongly alkaline solution useful for maintaining or raising pH in chemical processes. Analytical labs use phosphate buffers across a range of pH values; the dodecahydrate form makes it straightforward to prepare solutions by mass.
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Industrial Cleaning and Degreasing. TSP solutions cut grease, oil films, and carbonaceous soils from metal, concrete, and painted surfaces. It is a long-established ingredient in heavy-duty cleaning formulations — effective on shop floors, engine parts, and process equipment where you need an alkaline wash that rinses clean.
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Water Treatment. Municipal and industrial water-treatment operators use trisodium phosphate to adjust pH and to sequester hardness ions (calcium and magnesium). In boiler-water treatment, it helps control scale formation on heat-transfer surfaces.
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Laboratory Reagent. At ACS Reagent grade, this product is suitable for preparing standard solutions, titrations, and gravimetric analyses where phosphate ion concentration must be known with confidence. The lot-specific COA provides the documentation trail that lab accreditation programs require.
Handling & Storage
TSP dodecahydrate carries a GHS signal word of Danger (per the product's GHS classification). The applicable hazard statements are:
- H314 — Causes severe skin burns and eye damage (per the product's GHS classification)
- H315 — Causes skin irritation (per the product's GHS classification)
- H319 — Causes serious eye irritation (per the product's GHS classification)
- H335 — May cause respiratory irritation (per the product's GHS classification)
Wear chemical-splash goggles, chemical-resistant gloves, and a lab coat or long sleeves when handling. In dusty operations — scooping from a pail, transferring to a hopper — use a dust mask or work under local exhaust ventilation to avoid inhaling airite particles.
Store containers sealed in a cool, dry area. The dodecahydrate form can lose or gain water if exposed to wide humidity swings, which will change the effective assay per gram. Keep containers closed when not in use. HDPE pails and glass bottles are both suitable. Do not store next to strong acids — contact will generate heat and release fumes.
Hazmat & Shipping
Canonical transport status is not regulated. Review the current SDS and carrier requirements before shipment.
Documentation
A GHS-compliant Safety Data Sheet ships with every order and is available in English, Spanish, French, and Japanese. A Technical Data Sheet is also available for specification reference. Lot-specific Certificates of Analysis are provided on request — if your quality system requires incoming-material verification, ask for the COA at the time of order and we will include it in your shipment package.
Why Buy from Alliance Chemical
We are a chemical distributor that physically stocks, packs, and ships this product from our Taylor, TX facility — not a broker forwarding your PO to someone else. Orders ships under the stated handling schedule. Our shipping and handling guidance is reviewed by Andre Taki, DOT Hazmat Specialist, so the packaging and labeling on your pallet meet regulatory requirements before the carrier picks it up.
If you need help selecting the right grade, sizing a pack quantity for your process, or pulling documentation for an audit, our team handles those calls directly. We have been in the chemical distribution business since 1998 and have shipped over 50,000 orders — we know how to get product to your dock correctly and on time.
