Sodium Sulfite
<p><b >Sodium sulfite</b> (<b >sodium sulphite</b>) is a soluble <a href="http://en.wikipedia.org/wiki/Sodium" title="Sodium" >sodium</a> <a href="http://en.wikipedia.org/wiki/Salt_(chemistry)" title="Salt (chemistry)" >salt</a> of <a href="http://en.wikipedia.org/wiki/Sulfurous_acid" title="Sulfurous acid" >sulfurous acid</a>with the <a href="http://en.wikipedia.org/wiki/Chemical_formula" title="Chemical formula" >chemical formula</a> <a href="http://en.wikipedia.org/wiki/Sodium" title="Sodium" >Na<sub >2</sub></a><a href="http://en.wikipedia.org/wiki/Sulfur_monoxide" title="Sulfur monoxide" >SO<sub >3</sub></a>. It is a product of <a href="http://en.wikipedia.org/wiki/Sulfur_dioxide" title="Sulfur dioxide" >sulfur dioxide</a> scrubbing, a part of the <a href="http://en.wikipedia.org/wiki/Flue-gas_desulfurization" title="Flue-gas desulfurization" >flue-gas desulfurization</a> process. </p>
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It is also used as a <a href="http://en.wikipedia.org/wiki/Preservative" title="Preservative" >preservative</a> to prevent <a href="http://en.wikipedia.org/wiki/Dried_fruit" title="Dried fruit" >dried fruit</a> from discoloring, and for preserving meats, and is used in the same way as <a href="http://en.wikipedia.org/wiki/Sodium_thiosulfate" title="Sodium thiosulfate" >sodium thiosulfate</a> to convert elemental <a href="http://en.wikipedia.org/wiki/Halogen" title="Halogen" >halogens</a> to their respective hydrohalic acids, in <a href="http://en.wikipedia.org/wiki/Photography" title="Photography" >photography</a> and for reducing <a href="http://en.wikipedia.org/wiki/Chlorine" title="Chlorine" >chlorine</a> levels in pools.</p>