Analysis of Group III/IV Cations

Analysis of Group III/IV Cations
Experiment 19






Sharon Gaines
Sect. 16
TA: Carolyn Simmons
Nov 6, 2003




























Purpose:
The purpose of this experiment was to identify several cations from Group III and IV.
A variety of complex formations and flame tests were used to identify these cations as carbonates or sulfides.

Procedure:
Group III
• 6M HCl was added to the known Group III and IV solution which contained Fe2+, Fe3+, Mn2+, Ba2+, and Sr2+. 6M NH3 was then added until the solution proved to be basic. An additional amount of 6M NH3 was then added and stirred thoroughly.
• 1M thioacetamide solution was then added and heated for 10 minutes. The solution was then centrifuged for 2 minutes. An additional drop of thioacetamide was then added to insure complete precipitation. The supernatant was then decanted a...