Ammonium phophomolybdate trihydrate

Ammonium Phosphomolybdate Trihydrate
Other Names: Ammonium 12-molybdophosphate trihydrate; Ammonium phosphomolybdate(VI); Phosphomolybdic acid, ammonium salt, trihydrate
CAS Number: 12027-67-7
Chemical Formula: (NH₄)₃[PMo₁₂O₄₀]·3H₂O
Molar Mass: Approx. 1877.6 g/mol (trihydrate form)
Appearance: Yellow crystalline powder

Description:
Ammonium phosphomolybdate trihydrate is a yellow, water-insoluble inorganic compound belonging to the class of heteropoly acids and their salts. It consists of a Keggin anion with molybdenum atoms arranged around a central phosphate group. It is primarily used in analytical chemistry for the gravimetric or colorimetric determination of various cations, especially rare earths and alkaloids.

Chemical and Physical Properties

• Density: Not precisely defined; varies due to hydration

• Melting Point: Decomposes upon heating

• Boiling Point: Not applicable (solid, decomposes)

• Solubility in Water: Practically insoluble

• Solubility in Other Solvents: Soluble in ammonia and dilute acids

• Odor: Odorless

Applications

• Analytical Chemistry: Used as a reagent for the detection and precipitation of alkaloids, lead, potassium, and rare earth metals.

• Staining Agent: Employed in histological staining and microscopy.

• Catalysis: Studied for potential use as a heterogeneous catalyst in organic reactions.

• Precipitation Agent: Useful in the preparation of phosphomolybdate complexes for research purposes.

Safety

Signal Word: Warning

• Hazard Statements (H):

  • H315: Causes skin irritation.
  • H319: Causes serious eye irritation.
  • H335: May cause respiratory irritation.

• Precautionary Statements (P):

  • P261: Avoid breathing dust/fume/gas/mist/vapors/spray.
  • P264: Wash hands thoroughly after handling.
  • P271: Use only outdoors or in a well-ventilated area.
  • P280: Wear protective gloves/protective clothing/eye protection/face protection.
  • P302+P352: IF ON SKIN: Wash with plenty of water.
  • P304+P340: IF INHALED: Remove person to fresh air and keep comfortable for breathing.
  • P305+P351+P338: IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
  • P332+P313: If skin irritation occurs: Get medical advice/attention.
  • P337+P313: If eye irritation persists: Get medical advice/attention.
  • P403+P233: Store in a well-ventilated place. Keep container tightly closed.
  • P501: Dispose of contents/container in accordance with local/regional/national/international regulations.

Handling and Storage

• Handling Precautions: Avoid creating or inhaling dust. Use in well-ventilated areas. Minimize skin and eye contact.

• Storage Conditions: Store in a tightly closed container in a dry, cool, and well-ventilated area. Keep away from incompatible substances such as strong acids or bases.