A sample contains MgNH₄(PO₄)₂,Sb₂S₃,KBr,Cr(OH)₃,and PbCl₂.Identify the precipitate after the addition of 6 M HCl. A) MgNH₄(PO₄)₂ B) Sb₂S₃ C) KBr D) Cr(OH)₃ E) PbCl₂

Question

Quizplus · Accepted Answer

Upon addition of HCl, precipitation reactions occur only when one of the reactants is a salt that contains an anion that can combine with H+ to form an insoluble salt. PbCl12 is such a salt, and adding HCl would produce an excess of Cl- ions, which would react with Pb2+ to form the insoluble salt PbCl2. Therefore, PbCl₂ is the precipitate formed upon the addition of 6 M HCl.

A Sample Contains MgNH4(PO4)2, Sb2S3,KBr,Cr(OH)3,and PbCl2

A Sample Contains MgNH₄(PO₄)₂,Sb₂S₃,KBr,Cr(OH)₃,and PbCl₂