Pre Finals ReviewerPharChemLab

Experiment 4: Group I Cations (Silver or Chloride Group)ReagentAg+Pb2+Hg22+

FormulaColor & NatureFormulaColor & NatureFormulaColor & Nature

HClAgClwhite curdy pptPbCl2white crystal pptHg2Cl2white curdy ppt

a.) boiling waterinsolubleaq. soln of PbCl2solubleinsoluble

b.) excess NH4OHAg(NH3)2colorless solninsolubleHgNH2Cl & Hg0white & black ppt

NH4OHAgOHAg2OwhitebrownpptPb(OH)2white pptHgO.HgNH2NO3and Hg0white & black ppt

a.) excessAg(NH3)2sol. colorless solninsol. white amorpous pptHg2Oblack ppt

NaOHAgOHAg2OwhitebrownpptPb(OH)2white pptHg2Oblack ppt

a.) excessinsolublePb(OH)4or Na2PbO2sol. colorless solninsoluble

K2CrO4Ag2CrO4brownish redpptPbCrO4yellowpptHg2CrO4orange redppt butbrownish redon boiling

a.) NaOHinsolubleNa2PbO2

sol.yellowsolninsoluble

KIAgIcanary yellowpptPbI2yellowpptHg2I2greenish yelloworgreenppt

a.)insolubleinsolubleHgI4-2& Hg0or K2HgI4& Hg0colorless soln with black orgrayppt.