Lab Cation Quiz Flashcards
1
Q
Ag+ absent
A
the unknown solution gave no precipitate with 6M HCl
2
Q
Cr3+ present, Al3+ absent
A
The unknown solution gave a green precipitate with NH3.
NH4Cl that dissolved in NaOH + H2O2.
Addition of 6M HCl gave a yellow solution but no precipitate
3
Q
Sr+ present
A
The decantate from (b) gave a white precipitate with (NH4)2C2O4
4
Q
Zn2+ present
Mg2+ and Ni2+ absent
A
the decantant from (c) gave no precipitate with excess NaOH, but the addition of 6M HCl and K4Fe(CN)6 gave a gray-blue precipitate
5
Q
Fe3+, Sr2+
A
NH3
Fe(OH)3
6
Q
Ag+, Fe3+
A
HCl
AgCl
7
Q
Zn2+, Ni2+
A
NaOH
Ni(OH)2
8
Q
Cr3+, Ag+
A
HCl
AgCl
9
Q
Al3+, Fe3+
A
NaOH
Fe(OH)3
10
Q
Fe3+, Cr3+
A
NaOH
Fe(OH)3
11
Q
Ni2+, Fe3+
A
NH3
Fe(OH)3
12
Q
Zn2+, Mg2+
A
NaOH
Mg(OH)2
13
Q
Sr2+, Mg2+
A
(NH42C2O4)
SrC2O4
14
Q
Sr2+, Zn2+
A
(NH4)2C2O4
SrC2O4
