Analyze the table of some common inorganic precipitating agents and answer the following questions: a. Zn and Sn ions coprecipitate when they exist in solution to form mixed oxides. Suggest a precipitating agent that precipitate one of the oxides only. b. A silver chloride precipitate is precipitated in gravimetric analysis. Which solution would you recommend to wash the precipitate: AgNO3 or HNO3. Justify your answer. PrecipitatingElement precipitatedagentNH3(aq)Be (BeO), Al (A12O3), Sc(Sc203), Cr (Cr2O3), Fe (Fe2O3) Ga (Ga2O3),Zr (ZrO2), In (In2O3), Sn (SnO2), U (U3O8)H2SCu (CuO), Zn (ZnO or Zn2O4), Ge (GeO), As (As203 or As205), Mo(Mo03), Sn (SnO2), Sb (Sb2O3 or Sb205)(NH4)2SHg (HgS), Co (Co304)(NH4)2HPO4Mg (Mg2P207), Al (AIPO4), Mn (MN2P2O7), Zn (Zn2P207), Zr(Zr2P2O7), Cd (Cd2P207), Bi (BİPO4)H2SO4Li, Mn, Sr, Cd, Pb, Ba (all as sulfates)H2C2O4Ca (CaO), Sr (SrO), Th (ThO2)HCIAg (AgCl), Hg (H92C12), Na (NaCI), Si (SiO2)AGNO3Cl (AgCl), Br (AgBr), I (Agl)(NH4)2CO3Bi (Bi2O3)NH4SCNCu [Cu2(SCN)2]HNO3Sn (SnO2)SO² (BaSO4)2-BaCl2

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Chemistry by OpenStax (2015-05-04)

1st Edition

ISBN:9781938168390

Author:Klaus Theopold, Richard H Langley, Paul Flowers, William R. Robinson, Mark Blaser

Publisher:Klaus Theopold, Richard H Langley, Paul Flowers, William R. Robinson, Mark Blaser

Chapter18: Representative Metals, Metalloids, And Nonmetals

Section: Chapter Questions

Problem 25E: A chemist dissolves a 1.497-g sample of a type of metal (an alloy of Sn, Pb, Sb, and Cu) in nitric...

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Analyze the table of some common inorganic precipitating agents and answer the following questions:

a. Zn and Sn ions coprecipitate when they exist in solution to form mixed oxides. Suggest a precipitating agent that precipitate one of the oxides only.

b. A silver chloride precipitate is precipitated in gravimetric analysis. Which solution would you recommend to wash the precipitate: AgNO₃ or HNO₃. Justify your answer.

Precipitating
Element precipitated
agent
NH3(aq)
Be (BeO), Al (A12O3), Sc(Sc203), Cr (Cr2O3), Fe (Fe2O3) Ga (Ga2O3),
Zr (ZrO2), In (In2O3), Sn (SnO2), U (U3O8)
H2S
Cu (CuO), Zn (ZnO or Zn2O4), Ge (GeO), As (As203 or As205), Mo
(Mo03), Sn (SnO2), Sb (Sb2O3 or Sb205)
(NH4)2S
Hg (HgS), Co (Co304)
(NH4)2HPO4
Mg (Mg2P207), Al (AIPO4), Mn (MN2P2O7), Zn (Zn2P207), Zr
(Zr2P2O7), Cd (Cd2P207), Bi (BİPO4)
H2SO4
Li, Mn, Sr, Cd, Pb, Ba (all as sulfates)
H2C2O4
Ca (CaO), Sr (SrO), Th (ThO2)
HCI
Ag (AgCl), Hg (H92C12), Na (NaCI), Si (SiO2)
AGNO3
Cl (AgCl), Br (AgBr), I (Agl)
(NH4)2CO3
Bi (Bi2O3)
NH4SCN
Cu [Cu2(SCN)2]
HNO3
Sn (SnO2)
SO² (BaSO4)
2-
BaCl2

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