Lab Chemical-60

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

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

Synonym: Sulfurous Acid, Disodium Salt 

Chemical Name: Sulfurous acid, Disodium salt 

Chemical Formula: Na2So3

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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.

Sodium Metabisulfite supplier and exporter.  Sodium Metabisulphite also called sodium pyro sulphite. Food grade of Sodium sulphite is used as preservative agent, reducing agent, Antibrowning agent, antioxidant, flour treatment agent also as preservative in biscuit industries.

We are keeping ready stock of Sodium Metabisulfite in 25 Kg and 50 Kg pack. And we are one of popular sodium metabisulphite supplier in Mumbai, Kandla - Gandhidham, Chennai - Ennore, Visakhapatnam, Kolkata, Fujairah, Dubai,  Sharjah, Abu Dhabi, Sodium Sulphite supplier in Barka Ruwi Muscat Oman

Sodium Metabisulfite is White crystals or crystalline powder having an odour of sulfur dioxide
 

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.