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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.

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.

Introductory Chemistry: A Foundation
Introductory Chemistry: A Foundation
9th Edition
ISBN:9781337399425
Author:Steven S. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Donald J. DeCoste
Chapter7: Reactions In Aqueous Solutions
Section: Chapter Questions
Problem 28QAP: The procedures and principles of qualitative analysis are coy cred in many introductory chemistry...
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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
Transcribed Image Text: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
Transcribed Image Text: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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