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Reference.org
Potassium tetraiodomercurate(II)
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<p>Potassium tetraiodomercurate(II) is an <a href="/facts/Inorganic_compound/TfFfzxSz">inorganic compound</a> with the <a href="/facts/Chemical_formula/hghUtthl">chemical formula</a> <a href="/facts/Potassium/FWPwS7Rj">K</a>2[<a href="/facts/Mercury_(element)/WlxfoHva">Hg</a><a href="/facts/Iodine/JlfMecMf">I</a>4]. It consists of <a href="/facts/Potassium/FWPwS7Rj">potassium</a> cations and tetraiodomercurate(II) anions. It is the active agent in Nessler's reagent, used for detection of <a href="/facts/Ammonia/MtLtJFtz">ammonia</a>. </p>