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Sodium bisulfite (or sodium bisulphite, sodium hydrogen sulfite) is a chemical mixture with the approximate chemical formula NaHSO 3.Sodium bisulfite is not a real compound, [2] but a mixture of salts that dissolve in water to give solutions composed of sodium and bisulfite ions.
The tables below provides information on the variation of solubility of different substances (mostly inorganic compounds) in water with temperature, at one atmosphere pressure.
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Solutions of bisulfite are typically prepared by treatment of sulfur dioxide with aqueous base: [3]. SO 2 + OH − → HSO − 3. HSO − 3 is the conjugate base of sulfurous acid, (H 2 SO 3).
Sodium bisulfate, also known as sodium hydrogen sulfate, [a] is the sodium salt of the bisulfate anion, with the molecular formula NaHSO 4.Sodium bisulfate is an acid salt formed by partial neutralization of sulfuric acid by an equivalent of sodium base, typically in the form of either sodium hydroxide (lye) or sodium chloride (table salt).
3 (aq) + H 2 O-0.276 2 [10] N: N 2 (g) + 8 H + + 6 e −: ⇌: 2NH + 4-0.27: 6 [16] V V 3+ + e −: ⇌ V 2+-0.26 1 [7] Ni Ni 2+ + 2 e −: ⇌ Ni(s) -0.257 2 [8] S: 2HSO − 4 + 2 H + + 2 e −: ⇌: S 2 O 2− 6 + 2 H 2 O (l)-0.253: 2 [6]: 790 As As(s) + 3 H + + 3 e −: ⇌ AsH 3 (g) -0.23 3 [13] N: N 2 (g) + 5 H + + 4 e −: ⇌: N 2 H + 5 ...
The following chart shows the solubility of various ionic compounds in water at 1 atm pressure and room temperature (approx. 25 °C, 298.15 K). "Soluble" means the ionic compound doesn't precipitate, while "slightly soluble" and "insoluble" mean that a solid will precipitate; "slightly soluble" compounds like calcium sulfate may require heat to precipitate.
As a reducing agent it is used in the textile industry as a bleaching, desulfurizing, and dechlorinating agent (e.g. in swimming pools). Its reducing properties are exploited in its use as a preservative to prevent dried fruit from discoloring, and for preserving meats. It is used as a reagent in sulfonation and sulfomethylation agent.