Product Overview

Potassium Dihydrogen Orthophosphate Anhydrous 99.5% AR/ACS (CAS No. 7778-77-0) is monobasic potassium orthophosphate, an amphiprotic phosphate salt that contributes both potassium ions and dihydrogen phosphate to aqueous media. The dihydrogen phosphate/hydrogen phosphate system provides useful buffering behaviour, while the salt is also a convenient defined source of orthophosphate for conventional chemical analysis.

The AR/ACS grade is positioned for classical analytical work, buffer and reagent preparation, laboratory QC and preparation of phosphate stock or working solutions where reagent-grade monopotassium phosphate is specified. Official analytical procedures use monobasic potassium phosphate in phosphate standards and reagents.

Typical Applications

• Preparation of phosphate buffers for conventional analytical procedures.
• Preparation of non-certified phosphate stock and working solutions where the method specifies monobasic potassium phosphate.
• Reagent preparation for colorimetric and wet-chemical phosphate procedures.
• pH control in analytical sample and reagent solutions.
• Laboratory quality-control and method-verification work involving phosphate media.
• Preparation of defined ionic media for equilibrium and solution-chemistry studies.

Common Synonyms

• Potassium dihydrogen phosphate
• Monopotassium phosphate
• Potassium phosphate monobasic
• Monobasic potassium phosphate
• Potassium acid phosphate
• Potassium dihydrogen orthophosphate

Storage Conditions

Keep tightly closed and dry to protect the anhydrous material from environmental moisture and laboratory contamination. For analytical use, use clean dispensing practices to minimise introduction of phosphate, ionic or particulate contaminants from external sources.