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Sodium Bisulphate and Sodium Bisulphite

Sodium bisulphate is commonly called as Niter Cake because it was formally obtained by the obsolete process of reacting nitrate, or niter, with sulphuric acid:

NaNO3 + H2SO4 → NaHSO4 + HNO3

It may also be formed when salt is moderately heated with sulphuric acid:

NaCl + H2SO4  →  NaHSO4 + HCl

It is an easy handled dry material that react like sulphuric acid. Major uses are in the manufacture of acid type toilet bowl cleaners and for industrial cleaning and metal pickling. Minor uses are in dye baths, carbonizing wool and various chemical processes.

Sodium Bisulphite
Sodium bisulfite finds industrial use either in solution or as a solid. The total solid is of the anhydrous form, and the pure reagent has the formula NaHSO3. The commercial product consist almost entirely of Na2S2O5 (sodium pyrosulfite), or sodium metabisulfite, which is the dehydrated derivative of two molecules of sodium bisulfite. The solution may be easily shipped, stored and handled in 316 stainless steel. Kynar and polyvinyl chloride (PVC) are also suitable construction materials with appropriate temperature limitations. This compound is usually sold as either a 38 or a 43% solution.

Major uses are as an antochlor for pulp, paper and textiles, and in water treatment and pollution control. It is also used in the tanning industry as a reducing agent for chrome solution and in manufacture of photographic and organic chemicals.
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