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Mercury(II) chloride
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<p>Mercury(II) chloride (mercury bichloride, mercury dichloride, mercuric chloride), historically also sulema or corrosive sublimate, is the inorganic <a href="/facts/Chemical_compound/37FXqqtv">chemical compound</a> of <a href="/facts/Mercury_(element)/WlxfoHva">mercury</a> and <a href="/facts/Chlorine/y27UwYBM">chlorine</a> with the <a href="/facts/Chemical_formula/hghUtthl">formula</a> HgCl2, used as a laboratory <a href="/facts/Reagent/c3GLInCu">reagent</a>. It is a white crystalline <a href="/facts/Solid/YU0hJq6f">solid</a> and a molecular compound that is very toxic to humans. Once used as a first line treatment for <a href="/facts/Syphilis/fdnGLyLT">syphilis</a>, it has been replaced by the more effective and less toxic <a href="/facts/Procaine_penicillin/d1GMT5kM">procaine penicillin</a> since at least 1948. </p>