nName:Prelaboratory Assignment:Name:Date:Section:Prelaboratory Assignment: Qualitative Analysis Group III Cations1. Prepare a complete flow chart for the procedure and put it on your data sheet.#10 Section:Cations#9Name:.Prelaboratory Assignment.Date:QUALITATIVE ANALYSIS OF GROUP III CATIONSQualitative analysis is a method for identifying the elementspresent in a unknown mixture.For this purpose, metal cations are broadly classified into threegroups based upon their solubilities.-The group I cations, Pb2+, Ag+, and Hg, are those which forminsoluble chlorides.-Group II cations, Cu2+, Bi, Hg2+, Cd2+, Sn4+, and Sb2+ forminsoluble sulfides below pH 0.5-Group III cations, Al, Cr, Co, Fe, Mn, Ni, and Zn²+,form insoluble sulfides above pH9.group IV cations, Ba 2+, Ca2+, Mg2+, Na+, K+, and NH4+, are theremaining common cations. Thealkaline earth members of this group form insoluble carbonateswhile the alkaline elements areidentified by flame tests. The ammonium ion is detected by alitmus test.These groups are easily separated by their markedly differentsolubilities. Separating thecations within a given group is more difficult but based upon thesame principle, as will be shown in the experimental section.NOTE: THE GROUPS USED FOR QUANTITATIVEANALYSIS ARE SOLELYBASED ON SOLUBILITY. THEY DO NOT IN ANY WAYCORRESPOND TO THEGROUPS OF THE PERIODIC TABLE.group III cations, Al*, Cr", Fe, Ni²+#10

The ammonium chloride and ammonia is used for detection of ions .

Answered: Name: Date: Section: Prelaboratory…

Name: Date: Section: Prelaboratory Assignment: Qualitative Analysis Group III Cations 1. Prepare a complete flow chart for the procedure and put it on your data sheet.

World of Chemistry, 3rd edition

3rd Edition

ISBN:9781133109655

Author:Steven S. Zumdahl, Susan L. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan L. Zumdahl, Donald J. DeCoste

Chapter15: Solutions

Section: Chapter Questions

Problem 63A

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Question

n
Name:
Prelaboratory Assignment:
Name:
Date:
Section:
Prelaboratory Assignment: Qualitative Analysis Group III Cations
1. Prepare a complete flow chart for the procedure and put it on your data sheet.
#10

Section:
Cations
#9
Name:
.
Prelaboratory Assignment.
Date:
QUALITATIVE ANALYSIS OF GROUP III CATIONS
Qualitative analysis is a method for identifying the elements
present in a unknown mixture.
For this purpose, metal cations are broadly classified into three
groups based upon their solubilities.
-The group I cations, Pb2+, Ag+, and Hg, are those which form
insoluble chlorides.
-Group II cations, Cu2+, Bi, Hg2+, Cd2+, Sn4+, and Sb2+ form
insoluble sulfides below pH 0.5
-Group III cations, Al, Cr, Co, Fe, Mn, Ni, and Zn²+,
form insoluble sulfides above pH9.
group IV cations, Ba 2+, Ca2+, Mg2+, Na+, K+, and NH4+, are the
remaining common cations. The
alkaline earth members of this group form insoluble carbonates
while the alkaline elements are
identified by flame tests. The ammonium ion is detected by a
litmus test.
These groups are easily separated by their markedly different
solubilities. Separating the
cations within a given group is more difficult but based upon the
same principle, as will be shown in the experimental section.
NOTE: THE GROUPS USED FOR QUANTITATIVE
ANALYSIS ARE SOLELY
BASED ON SOLUBILITY. THEY DO NOT IN ANY WAY
CORRESPOND TO THE
GROUPS OF THE PERIODIC TABLE.
group III cations, Al*, Cr", Fe, Ni²+
#10

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