Sodium Aluminium Sulphate commercially known as Soda-Alum is white hygroscopic powder normally used as an acidulent in food industry and also in manufacture of baking-powder. Soda-Alum is an acidulent in food and biscuit industry it helps slow liberation of carbon-di-oxide. It is also used in the manufacturer of Baking Powder which is widely used by people. There are many uses of soda-alum like as a Mordant in Dyeing, Waterproofing of Textile, Water Purification etc. Being hygroscopic in nature Soda-Alum requires to be kept in closed bags preferably in closed sheds. Soda-Alum is non-hazardous and non-toxic and does not require any special handling techniques. In closed bags Soda-Alum is quite stable.
Soda Alum helps in liberation of Carbon dioxide in two stages. In the dough stage due to presence of water a part of Carbon dioxide is liberated steadily, thus increasing the workability of dough. Balance of Carbon dioxide is liberated at the time of baking, making the baked product uniform and highly porous. The residual material from Soda Alum, after reaction with Sodium Bi Carbonate does not leave any unpalatable taste. Soda Alum has got highest neutralisation value(Bicarbonate equivalent of 104) and yet is cheapest of all the commercially available materials used for this purpose.
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