Description
ortho-Phosphoric acid 25 % is a pure-grade aqueous mineral acid solution for laboratory applications. It is based on phosphoric acid with CAS number 7664-38-2, empirical formula H₃PO₄ and molar mass 98,00 g/mol. The 25 % preparation has a density of 1,15 g/cm³ and a boiling point of 100 °C, Typical laboratory roles include pH control, buffer preparation, sample digestion support and general inorganic acid chemistry where a moderately concentrated phosphoric acid is preferred. Density and concentration data support accurate dilution and dosing in analytical and preparative protocols. This ortho-phosphoric acid solution from manufacturer Carl ROTH belongs to the standard chemicals range used across teaching, research and industrial laboratories. EG number 231-633-2 supports substance identification in inventory and safety documentation. Use appropriate personal protective equipment and follow laboratory acid-handling procedures when dispensing and storing the reagent.
This article is part of Acids, in Acids & bases.
Key features
- Assay: 24,0-27,0 %
- Density (20 °C): 1,1395-1,1597
- Chloride (Cl): ≤0,005 %
- Sulphate (SO4): ≤0,05 %
- Iron (Fe): ≤0,002 %
- Arsenic (As): ≤0,0001 %
- CAS number: 7664-38-2
- Pack sizes: 1 l, 2.5 l, 5 l, 10 l
- EG nr.: 231-633-2
- Empirical formula: H₃PO₄
- Concentration: 25 %
- Molar mass: 98,00 g/mol
- Technical Information Sheet:
- Safety Data Sheet:
Compliance & Safety Information

DangerHazard Statements (H-Phrases)
Precautionary Statements (P-Phrases)
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Questions about ortho-Phosphoric acid 25 %, pure, 1 l, plastic
What is this article?
ortho-Phosphoric acid 25 %, pure, 1 l, plastic is the article on this page. Luminix Health distributes Carl Roth for laboratory use. It sits in Acids, inside Acids & bases, in Lab chemicals.
An acid on this shelf is the substance itself, concentrated or as a stated solution: hydrochloric, sulfuric, nitric, acetic and the rest. Concentration, purity and the trace metals decide the use. A concentrated acid and a volumetric solution of the same name are different products, and both burn.
An acid donates a proton. A base accepts one. In the bottle, the practical differences are the concentration, the purity and the anion or cation that comes along. Concentrated mineral acids are a different article from a dilute volumetric solution. The water in the acid, and the trace metals, decide whether it can be used for analysis. Check the substance on PubChem and the classification on ECHA CLP. Transport is the UNECE dangerous-goods framework. The legal texts are the CLP Regulation and REACH.
Which category should I open next?
The category is Acids & bases. The sub-category is Acids. The catalogue is Lab chemicals.
Shelves beside this one are Bases & alkalis.
What should I check before I order?
When this page shows a safety data sheet, use that manufacturer file. Hazard text does not belong in the sales description. For a pack size, a grade or a certificate that is not on the page, send a quote request or contact the team.
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The seven catalogues are Labware, Lab chemicals, Lab instruments, Lab consumables, Chromatography equipment, Lab safety equipment and Life Science & Microbiology.

