Sodium meta bisulphite
Chemcial Formula : Na2S2O5
Physical Properties : Sodium metabisulphite is a white to slightly
yellowish solid ,or crystalline powder.It is an inorganic compound with faint
odour of sulphur dioxide . It is free flowing . It decomposes at its melting
point (150C). It is freely soluble in water . Its ph value is 3.5-5.
Uses : Some of the major applications of sodium meta bisulphite is
in starch and food industry . It is used as food additive, mainly as a
preservative. It may also cause allergic reaction as an additive . Dilute
quashes and candies also contain it in minute concentration . It finds its
place in purifying or isolating aldehydes and ketones . It is used in the
manufacture of sulphonated oil and resin . It provides a source of sulphur
dioxide , a reducing agent when mixed with water . It helps in removing
chloramine from water too . It can be used as an antiseptic rinse to sterilize
equipment . It is used as an oxygen scavinger to remove the dissolved oxygen
from waste water . It is also added to wine to resist the growth of bacteria as
well as to slow down its oxidation . It also act as an antichlor in chemical
industry and as a redox catalyst in acrylic fiber industry.
