CAS number : 10102-40-6
Molecular Weight: 241.9
Chemical Formula: Na2MoO4-2H2O
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Specifications of Commercial Pure Sodium Molybdate Dihydrate:
CAS Number: 10102-40-6
Appearance: White Crystalline Powder
Color of the solution: 10% solution in distilled water is clear and colorless
Assay: 99% minimum
MoO3 content: >58.37%
Mo content: >38.86%
Iron: 50 ppm maximum
Insoluble matter: Maximum 0.02%
Sodium Molybdate Dihydrate BP Grade
CAS Number: 10102-40-6
Content: /98.0 per cent to 100.5 per cent (dried substance).
Appearance: White or almost white powder or colourless crystals.
Solubility: Freely soluble in water.
A. Loss on drying (see Tests).
B. Dissolve 0.2 g in 5 ml of a mixture of equal volumes of nitric acid and water and add 0.1 g of ammonium chloride. Add 0.3 ml of disodium hydrogen phosphate solution and heat slowly at 50-60C. A yellow precipitate is formed.
C. Dissolve 0.15 g in 2 ml of water, the solution gives reaction of sodium.
Solution S: Dissolve 10.0 g in water and dilute to 50 ml with the same solvent.
Appearance of solution: Solution S is clear and colourless.
Chlorides: Maximum 50 ppm.
Phosphates: Maximum 200 ppm.
Ammonium: Maximum 10 ppm, determined on 0.10 g.
Heavy metals: Maximum 10 ppm.
Loss on drying: 14.0 per cent to 16.0 per cent, determined on 1.000 g by drying in an oven at 140C for 3 h.
Dissolve 0.100 g in 30 ml of water, add 0.5 g of hexamethylenetetramine and 0.1 ml of a 250 g/l solution of nitric acid. Heat to 60C. Titrate with 0.05 M lead nitrate using 4-(2-pyridylazo)resorcinol monosodium salt as indicator.
1 ml of 0.05 M lead nitrate is equivalent to 10.30 mg of Na2MoO4.
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