Product Overview

Ammonium Molybdate Tetrahydrate 99.3% AR/ACS (CAS No. 12054-85-2) is an inorganic molybdate salt, more specifically ammonium heptamolybdate tetrahydrate, containing molybdenum in the +6 oxidation state. In acidic analytical media, molybdate ions react with phosphate, silicate, and certain related species to form characteristic heteropoly complexes. These reactions make the compound particularly useful in colour-forming analytical methods.

The AR/ACS grade is intended for analytical reagent preparation, quality-control testing, research, and academic laboratory procedures requiring controlled composition and limited reagent-derived impurities. It is suitable for preparing molybdate reagent solutions used in qualitative testing, colorimetric determination, and spectrophotometric analysis.

Typical Applications

• Preparation of molybdate-containing analytical reagents
• Colorimetric and spectrophotometric determination of phosphate
• Determination of dissolved silica by molybdate-based methods
• Preparation of phosphomolybdate and silicomolybdate reagent systems
• Development and verification of molybdenum-based analytical procedures
• Routine analytical, quality-control, and inorganic chemistry work

Common Synonyms

• Ammonium Heptamolybdate Tetrahydrate
• Ammonium Paramolybdate Tetrahydrate
• Hexaammonium Heptamolybdate Tetrahydrate
• Molybdic Acid, Ammonium Salt, Tetrahydrate

Storage Conditions

Store in a tightly closed container in a cool, dry, and clean location. Protect the material from contamination and unnecessary exposure to atmospheric conditions. Reseal the container promptly after dispensing to preserve its composition and analytical reagent quality.