|
Procedure |
Observation |
Proposed Equations |
Identified Cations |
|
1 |
Unknown 1:Brown with floating particles, no smell
Unknown 2: Blue/light green coloring, no smell |
Ni²⁺+2OH⟶Ni(OH)₂(s) Ag⁺+OH⁻⟶2Ag(OH)⟶AgO+H₂O Pb²⁺+2OH⟶Pb(OH)₂(s) [Pb(OH)₄]²⁻ Al³⁺+3OH⟶Al(OH)₃(s) [Al(OH)₄]³⁻ Mn²⁺+2OH⟶Mn(OH)₂(s) Fe³⁺+3OH⟶Fe(OH)₃ NH₄⁺+OH |
Ag⁺, Pb²⁺,Ni²⁺, Mn²⁺,Fe²⁺, Al³⁺ |
|
2 |
Unknown 1: clear no precipitate
Unknown 2: light green precipitate formed |
Al³⁺+3HCl⟶3H⁺+Al(Cl)₃ Fe³⁺+3HCl⟶3H⁺+Fe(Cl)₃ Mn²⁺+2HCl⟶2H⁺+Mn(Cl)₃ Ni²⁺+2HCl⟶2H⁺+Ni(Cl)₃ Ag⁺+Cl⁻⟶AgCl(s) Pb²⁺+2Cl⁻⟶PbCl₂(s)
|
Ni²⁺, Mn²⁺, Fe³⁺, Al³⁺,Ag⁺,Pb²⁺ |
|
3 |
n/a |
Ag⁺+Cl⁻⟶AgCl(s) Pb²⁺+Cl₂⟶PbCl₂(s)
|
Ag⁺, Pb²⁺ |
|
4 |
n/a |
Ag⁺+Cl⁻⟶AgCl(s)
|
Ag⁺ |
|
5 |
Yellow coloring, clear |
Pb²⁺+SO₄⁻⟶PbSO₄(s) Pb²⁺+K₂CrO₄⟶PbCrO₄(s)+K₂ |
Disproves presence of Pb²⁺ ions |
|
6 |
Clear with light green precipitate |
Mn²⁺+2OH⟶Mn(OH)₂(s) Fe³⁺+3OH⟶Fe(OH)₃(s) Ni²⁺+2OH⟶Ni(OH)₂(s) |
Mn²⁺,Fe³⁺, Ni²⁺ |
|
7 |
Strong smell green precipitate formed |
Mn²⁺+2OH⟶Mn(OH)₂(s) Fe³⁺+3OH⟶Fe(OH)₃(s) |
Mn²⁺,Fe³⁺, Ni²⁺ |
|
8 |
no precipitate (there was no change) |
Mn²⁺+2OH⟶Mn(OH)₂(s) Fe³⁺+3OH⟶Fe(OH)₃(s) |
Fe³⁺, Ni²⁺ |
|
9 |
Light green Precipitate formed |
Fe⁺+K[Fe(CN)₆]⟶KFe[Fe(CN)₆] |
Fe³⁺ |
|
10 |
Turned bright pink/red, precipitate formed |
Ni²⁺+DMG⟶Ni(DMG)₂ |
Ni²⁺ |
|
11 |
n/a |
n/a |
n/a |
