the_qualitative_analysis_of_Ag_Cu_and_Zn - UNIVERSITI...

UNIVERSITI TEKNOLOGI MARA (PERLIS)
Chm 475 : LAB REPORT
STUDENT NAME
:
ROHAYA BINTI MOHMAD SUBOH
2015249872
EXPERIMENT
:
3
TITLE
:
QUALITATIVE ANALYSIS OF
TRANSITION METAL CATIONS
(Ag 2+ , Zn 2+ , Cu 2+ )
LAB GROUP
: RAS2452b
DATE OF REPORT SUBMISSION
: 15 October 2015
LAB PARTNER’S NAME :
MUHAMMAD LUQMAN BIN ALI
LECTURER’S NAME
:
SIR SHUKRI ISMAIL

INTRODUCTION
Based on their chemical and physical behavior, analytically, metal cations can be classified into five
groups as listed below:
a) Analytical Group I Cations
Ag + , Hg 2+ , Pb 2+
Form precipitate when reacted with HCl
b) Analytical Group II Cations
As 3+ , Bi 3+ , Cd 3+ , Cu 2+ , Hg 2+ , Pb 2+ , Sn 4+
Form precipitate when reacted with acidic H
2
S
c) Analytical Group III Cations
Co 3+ , Fe 2+ , Mn 2+ , Ni 2+ , Zn 2+ , * Al 3+ , Cr 3+
Form precipitate when reacted with H
2
S in NH
3
*Al 3+ is separated as Al(OH)
3
d) Analytical Group IV Cations
Ba 2+ , Ca 2+ , Mg 2+ , Sr 2+
Form precipitate when reacted with (NH
4
)
2
CO
3
or NH
4
HPO
4
e) Analytical Group V Cations
Na
+
, K
+
Form soluble salts when reacted with (NH
4
)
2
CO
3
or NH
4
HPO
4
In this experiment, we will conduct some test on confirmation on the presence of Ag + , Cu 2+ and Zn 2+
only. The confirmation test usually using redissolving the metal cation then followed by reprecipating
it by involves the complex ions which is confirming reagent for that particular cation.
OBJECTIVE
The objective of the experiment is to perform qualitative analysis to identify transition metal cations.
PROCEDURE
Procedure A
Two drops of 6M HCl is added into 1 mL of the solution which is mixture of metal cations (
Zn 2+ , Cu 2+ , Ag + ) .If precipitate of chloride is formed, the suspension is centrifuge for 1 minute.
One additional drop of 6M HCl is added to the clear supernatant to check for complete
precipitation. If precipitate is observed in the supernatant, centrifuge again for 1 minute.