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Describe a method that can be used to separate each of the following mixtures of metal...

Describe a method that can be used to separate each of the following mixtures of metal ions.

A. Ag+, Pb2+

B. Mn2+, Fe3+

C. Ni2+, Al3+

D. Cu2+, Ni2+

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Answer #1

A. Ag+, Pb2+

basic media --> OH- excess will precipitate Pb(OH)2 and leave Ag+ in solution

For Ag+, add S-2 ions to form Ag2S

B. Mn2+, Fe3+

Add NaSCN , so SCN- anf Fe+3 preciptates

Mn+2 remains in solution

preicpitate in basic media to form Mn(OH)2

C. Ni2+, Al3+

add Na2CO3, this precipitates NiCO3

for Al3+, add OH- to form Al(OH)3

D. Cu2+, Ni2+

add H2S in acidic media!, so CuS precipitates, Ni+2 remains in solution

in basic media, add (NH4)2S so Ni(OH)2 forms

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