Product Overview

Orthophosphoric Acid 85% AR (CAS No. 7664-38-2) is analytical-reagent phosphoric acid supplied at the stated 85% concentration. Its triprotic acid–base system gives access to multiple phosphate equilibria and enables controlled adjustment of acidity across a wide range of conventional analytical solution systems.

The AR grade is intended for wet-chemical analysis, analytical reagent and buffer preparation, sample acidification and laboratory quality-control work. It is suitable for preparation of phosphate solutions and method-defined acidic media where analytical-reagent purity is required.

Typical Applications

• Preparation of analytical phosphate solutions
• Preparation of phosphate buffer systems
• Sample and reagent acidification
• Acid–base and phosphate-equilibrium studies
• Conventional wet-chemical analysis
• Preparation of analytical reagent mixtures
• Laboratory quality-control procedures

Common Synonyms

• Phosphoric acid
• Orthophosphoric acid
• Phosphoric(V) acid
• o-Phosphoric acid

Storage Conditions

Store tightly closed and protect from analytical contamination and uncontrolled concentration change. Use clean transfer equipment for quantitative reagent and buffer preparation.