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Sodium sulfate
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<p>Sodium sulfate (also known as sodium sulphate or sulfate of soda) is the <a href="/facts/Inorganic_compound/TfFfzxSz">inorganic compound</a> with formula Na2SO4 as well as several related <a href="/facts/Hydrate/dev82l69">hydrates</a>. All forms are white solids that are highly soluble in water. With an annual production of 6 million <a href="/facts/Tonne/gMymLmWv">tonnes</a>, the decahydrate is a major <a href="/facts/Commodity/zD0Em9v7">commodity</a> chemical product. It is mainly used as a filler in the manufacture of powdered home <a href="/facts/Laundry_detergent/J7yf1cQP">laundry detergents</a> and in the <a href="/facts/Kraft_process/bJAAtnlT">Kraft process</a> of paper <a href="/facts/Pulping/wIlq5nWm">pulping</a> for making highly alkaline <a href="/facts/Sulfide/d8YMjLeu">sulfides</a>. </p>