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.
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- Winter '20
- Distillation, precipitate, white precipitate, red maroon precipitate