Antioch University McGregor Separate Scheme Lab Report We did an experiment about Qualitative analysis. I was given a solution, and I was asked to indicate 4 unknown cations based on the separation scheme we have done the lab before it ( I will upload a copy of it). I did the procedures, and I found the unknown cations by adding the reagents, they were ( Ag, Pb, Ni, and Mn). Now I need another separation scheme for the four cations I found, four chemical equations for each cation, and a reasoning discussion regarding to how I found the four cations in based on the procedures. See the rubric for more info. +
2+
3+
2+
3+
2+
2+
2+
( )
, ( )
, ( )
, ( )
, ( )
, ( )
, ( )
, ( )
3.0 NaCl
( ) , ( )
3+
2+
3+
2+
2+
2+
( )
, ( )
, ( )
, ( )
, ( )
, ( )
Heat
1 M 2 4
2+
( )
( )
15 4
KI (aq)
Yellow ppt
( 3)( )
3+
2+
3+
2+
2+
( )
, ( )
, ( )
, ( )
, ( )
( )4( )
3 M 3 (aq)
2 4 (aq)
Yellow ppt
( )2
6 M ( )
, ( )3( ) , ( )3( )
3 M NaOH
6 M ( ) , ( ) +
White + ppt.
( )2 , ( )3( )
6 M , ,
2 ( )
KCSN (aq)
Blood-like Red
−
4( )
Aluminon
2+
( )
3( )
Red/Brown
ppt
2+
( )
, 2+ ( )
Dark Red + ppt
( )
KI (aq)
Red/Oran
-ge ppt
2+
( )
Dimethy. (aq)
Red ppt
Qualitative Analysis Report
Criteria
Ratings
Pts
Overall
Separation
Scheme
17.0 pts
Correct separation given for each of the 8 cations; Final form indicated for all
products (cation, precipitate, or complex ion); Organized, computer generated and
well presented
0.0 pts
No
Marks
17.0 pts
Unknown
Separation
Scheme
25.0 pts
Correct separation for all four cations in unknown; Correct confirmatory test listed
for all four cations in unknown; Final form indicated for all products (cation,
precipitate, or complex ion); Organized, computer generated and well presented
0.0 pts
No
Marks
25.0 pts
Reactions
20.0 pts
All required chemical equations present and correct; All chemical equations
complete with final form indicated [(s), (aq)] and ion charges; Well presented and
clearly linked to the Unknown Separation Scheme
0.0 pts
No
Marks
20.0 pts
Discussion
30.0 pts
Reasoning presented for the identification of all four cations in unknown solution;
Reasoning is backed up with data from lab notebook and the chemistry behind the
results; Discussion is clearly presented, organized and succinct
0.0 pts
No
Marks
30.0 pts
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