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Heptamolybdate or Hexaammonium Molybdate Ammonium Molybdate Tetrahydrate
CAS Number: 12027-67-7, 12054-85-2 Tetrahydrate and 13106-76-8 Anhydrous
Molecular Formula: (NH4)6Mo7O24
Molecular Weight: 1235.86
Heptamolybdate or Hexaammonium Molybdate Ammonium Molybdate Tetrahydrate
Ammonium Molybdate USP Grade Specifications:
(NH4)6Mo7O24-4H2O --- 1236.00
Molybdate (Mo7O24-), hexaammonium, tetrahydrate;
Hexaammonium molybdate tetrahydrate CAS 12054-85-2
DEFINITION
Ammonium Molybdate contains NLT 99.3% and NMT 101.8% of (NH4)6Mo7O24-4H2O.
IDENTIFICATION
Procedure
Sample: 0.6 g
Analysis: Dissolve the Sample in 1.4 mL of water and 1.45 mL of ammonium hydroxide. Cool this mixture, and add slowly, with mixing, 7.2 mL of a well-cooled mixture of 3.2 mL of nitric acid and 4 mL of water. Allow to stand for 24 to 48 h, and pass through a sintered-glass filter. To 5 mL of the filtrate add 2 mL of dibasic sodium phosphate.
Acceptance criteria: A yellow precipitate is formed, and it is soluble in an excess of 6 N ammonium hydroxide.
ASSAY
Acceptance criteria: 99.3% to 101.8%
Acceptance criteria: Any blue color in the Sample solution does not exceed that in the Control solution (NMT 10 ppm).
Chloride and Sulfate, Chloride: A 0.5-g portion shows no more chloride than 0.30 mL of 0.001 N hydrochloric acid (NMT 20 ppm).
Chloride and Sulfate, Sulfate: A 0.25-g portion shows no more sulfate than corresponds to 1.0 mL of 0.001 N sulfuric acid (NMT 200 ppm).
Insoluble Substances:
Sample: 20 g
Analysis: Dissolve the Sample in 200 mL of water in a beaker, heat to boiling, cover, and heat on a steam bath for 1 h. Pass the hot solution through a tared filtering crucible, wash the insoluble residue with hot water, and dry at 105C for 2 h.
Acceptance criteria: The weight of the residue is NMT 1 mg (0.005%).
Nitrate:
Sample: 1 g
Analysis: Dissolve the Sample in 10 mL of water containing 5 mg of sodium chloride and add 0.10 mL of a solution (1 in 1000) of indigo carmine in 3.6 N sulfuric acid.
Acceptance criteria: The blue color is not completely discharged in 5 min.
Magnesium and Alkali Salts:
Sample: 5.0 g
Analysis: Dissolve the Sample in 50 mL of water, and filter. To the filtrate add 0.5 g of sodium carbonate and 25 mL of 2.5 N sodium hydroxide. Boil the solution gently for 5 min, cool, and pass through an ignited and tared filter. Wash the filter with 1 N ammonium hydroxide. Ignite the filter at 800±25C for 30 min.
Acceptance criteria: The weight of the residue does not exceed 1 mg (NMT 0.02%).
Phosphate:
Standard solution: Dissolve 143.3 mg of dried monobasic potassium phosphate in water to make 1000 mL, and then dilute 1.0 mL of this solution with 3 N ammonium hydroxide to 100 mL.
Sample solution: Dissolve 20 g of the analyte in 100 mL of 3 N ammonium hydroxide.
Analysis
Samples: Standard solution and Sample solution
Add 3.5 mL of ferric nitrate solution (1 in 10) and allow to stand for 15 min. Warm gently to coagulate the precipitate, and filter. Wash the filter several times with 1.5 N ammonium hydroxide, then wash the filter with 60 mL of warm 4 N nitric acid to dissolve the residue on the filter, collecting the filtrate in a glass-stoppered, 250-mL conical flask. Add 13 mL of ammonium hydroxide, warm to 40C, add 50 mL of ammonium molybdate, shake for 5 min, and allow to stand at 40C for 2 h.
Acceptance criteria: Any yellow precipitate formed from the Sample solution does not exceed that from the Standard solution (5 ppm).
Ammonium Molybdate Tetrahydrate Analytical Reagent grade
Ammonium Heptamolybdate Tetrahydrate
(NH4)6Mo7O24-4H2O
Formula Weight 1235.86
CAS Number 12027-67-7
REQUIREMENTS
Assay (as MoO3): 81.0-83.0%
Insoluble matter: 0.005%
Chloride (Cl): 0.002%
Nitrate (NO3): Passes test
Arsenate, phosphate, and silicate (as SiO2): 0.001%
Phosphate (PO4): 5 ppm
Sulfate (SO4): 0.02%
Heavy metals (as Pb): 0.001%
Magnesium (Mg): 0.005%
Potassium (K): 0.002%
Sodium (Na): 0.01%
Please visit SDS Safety Data Sheet of Heptamolybdate or Hexaammonium Molybdate Ammonium Molybdate Tetrahydrate Suppliers.
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