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Reference.org
Monopotassium phosphate
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<p>Monopotassium phosphate (MKP) (also, potassium dihydrogen phosphate, KDP, or monobasic potassium phosphate) is the <a href="/facts/Inorganic_compound/TfFfzxSz">inorganic compound</a> with the formula KH2PO4. Together with <a href="/facts/Dipotassium_phosphate/Q6e1j7Mz">dipotassium phosphate</a> (K2HPO4.(H2O)x) it is often used as a <a href="/facts/Fertilizer/ysh3r6NJ">fertilizer</a>, <a href="/facts/Food_additive/jGk8zjn8">food additive</a>, and <a href="/facts/Buffering_agent/zrLz9eaa">buffering agent</a>. The salt often cocrystallizes with the dipotassium salt as well as with <a href="/facts/Phosphoric_acid/l6NbwyCv">phosphoric acid</a>. </p><p><a href="/facts/Single_crystal/UMG5pFp9">Single crystals</a> are <a href="/facts/Dielectric/PnVt9P2G">paraelectric</a> at room temperature. At temperatures below −150 °C (−238 °F), they become <a href="/facts/Ferroelectric/DLVYFNQT">ferroelectric</a>. </p>