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Sodium hydrosulfite is the common commercial name for products containing sodium dithionite, Na 2 S 2 O 4, as the effective ingredient. China is by far the largest producer of the dry product producing 30% of the world's capacity. There are main two conventional approaches to produce sodium hydrosulfite. (i) Sodium hydrosulfite is prepared by the reaction of sodium bisulfite with zinc by the following reaction:
Which materials absorb the most water? Quick Answer. As of 2014, a novel material called upsalite is the world's most water-absorbent material. Made of nanostructured anhydrous magnesium carbonate, this material is capable of absorbing several hundred times its weight in water, even in low-humidity conditions.