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Reference.org
Potassium sulfate
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<p>Potassium sulfate (US) or potassium sulphate (UK), also called sulphate of potash (SOP), arcanite, or archaically potash of sulfur, is the <a href="/facts/Inorganic_compound/TfFfzxSz">inorganic compound</a> with formula K2SO4, a white water-<a href="/facts/Solubility/kLE9h3Jb">soluble</a> solid. It is commonly used in <a href="/facts/Fertilizer/ysh3r6NJ">fertilizers</a>, providing both <a href="/facts/Potassium/5lcumVgo">potassium</a> and <a href="/facts/Sulfur/IK0amTfM">sulfur</a>. </p>