Experiment 9 & 10

Experiment 9 & 10 - Experiment 9 Qualitative...

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Experiment 9 Qualitative Analysis
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Purpose To learn how to identify the constituents of an unknown sample containing ions To teach careful laboratory manipulation, critical observation, and logical interpretation of results To teach descriptive inorganic chemistry To illustrate separation techniques based on ionic equilibria
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Principles Qualitative analysis uses the concept that a single common chemical test can determine the presence or absence of a group of ions Once a group is detected, individual tests can be used to determine the presence of a given ion
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Cation Group I Acid Chlorides: Ag + , Pb 2+ , Hg 2 2+ Chloride salts of these cations have low solubility in water – will ppt Add HCl will ppt out the salts and low acidity will prevent other solids from forming Can separate the 3 solids by variations in temperature or by forming complexes
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Acid Sulfides: Cu 2+ , Cd 2+ , Bi 3+ Basic Sulfides: Ni 2+ , Cr 3+ , Fe 3+ Form insoluble salts in the presence of sulfide ion; pptn depends on K sp which, in turn, depends on [S 2- ]
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This note was uploaded on 05/01/2011 for the course CHEM 112 taught by Professor Hibbard during the Spring '08 term at Spelman.

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Experiment 9 & 10 - Experiment 9 Qualitative...

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