Sodium Metabisulfite also called Sodium disulfite, disodium pentaoxodisulfate, disodium pyrosulfite.
Sodium Metabisulphite C.A.S. number is 7681-57-4 and its Chemical formula. Na2S2O5 and molecular weight is 190.11
Synonym: Sulfurous Acid, Disodium Salt
Chemical Name: Sulfurous acid, Disodium salt
Chemical Formula: Na2So3
The storekeepers ensure that the chemicals are stored in sealed packaging so that these remain free from contamination & moisture during the transit.
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ANALYTICAL PROPERTIES
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PHOTO GRADE Sodium Sulphite
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SODIUM SULPHITE WT%
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98.5 MIN
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SODIUM SULPHATE WT%
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1.5 MAX
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SODIUM CHLORIDE WT%
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0.10 MAX
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SODIUM CARBONATE WT%
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0.1 MAX
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MOISTURE %
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0.05 MAX
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INSOLUBLES %
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0.1 MAX
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IRON(Fe) PPM
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5 MAX
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HEAVY METALS(Pb) PPM
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10 MAX
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In the photographic industry to protect developer solutions from oxidation and (as hypo clear solution) to wash fixer (sodium thiosulfate) from film and photo-paper emulsions.
HOW to TEST purity of Sodium Sulfite?
PURITY TESTS
Reagents: Hydrochloric acid, hydrazinium sulfate, standard selenium solution (100µg Se/ml)
Procedure
Weigh 2.0 ± 0.1 g of sample and transfer to a 50-ml beaker. Add 10 ml water, 5 ml hydrochloric acid and boil to remove SO2.
Into a second beaker, weigh 1.0 ± 0.1 g of sample, add 0.05 ml standard selenium solution and proceed as above.
To each beaker add 2 g hydrazinium sulfate and warm to dissolve. Let stand for 5 min. Dilute the contents of each beaker to 50 ml in a Nessler tube and compare the colour of the two solutions. The sample should be less pink than the sample with the added standard.
METHOD OF ASSAY
Weigh 0.2 g of the sample to the nearest mg, add to 50.0 ml of 0.1 N iodine in a glass-stoppered flask, and stopper the flask. Allow to stand for 5 min, add 1 ml of hydrochloric acid, and titrate the excess iodine with 0.1 N sodium thiosulfate, adding starch TS as the indicator. Each ml of 0.1 N iodine is equivalent to 4.753 mg of Na2S2O5.
It is used in chemical manufacturing as a sulfonation and sulfomethylation agent.
Our range includes Sodium Thiosulphate, Sodium Acetate, Sodium Metabisulphite, Sodium Bisulphite, Sodium Sulphite Anhydrous, Ammonium Sulphate, Ammonium Chloride, Magnesium Sulphate, Sodium Phosphate (Mono / Di / Tri) etc.
Also we are keeping ready stock of these products :
SODIUM SULPHATE 99% WHITE POWDER CRYSTAL 50 KG BAG
PHOSPHORIC ACID 85% WHITE LIQUID POWDER
Caustic Soda Lye
HYDROGEN PEROXIDE 50% LIQUID 35 KG CARBOY PACK
CITRIC ACID 99% POWDER
caustic soda flakes
BLEACHING POWDER
SODIUM NITRATE
ACETIC ACID
