Experiment 9 - QUALITATIVE ANALYSIS OF CATIONS Unknown...

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Recitation April 10 1 QUALITATIVE ANALYSIS OF CATIONS & Unknown April 3 & 10 –Qualitative Analysis I part II Unknown Next week April 7-11-last lab. April 10 Recitation –questions regarding Qualitative Analysis Report Week of April 14-17 -Turn in your Qualitative Analysis Report April 24 – Exam #2 A mixture of six cations that will be analyzed are: Ag + , Fe 3+ , Cr 3+ , Ca 2+ , Zn 2+ and Ni 2+
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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 Recitation April 10 2
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Principle 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 Recitation April 10 3
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Procedure – Weeks 1&2 Terms: Precipitate – solid formed Decantate (or supernatant) – liquid above the solid Litmus paper – red paper turns blue if basic, blue paper turns red if acidic Be careful to keep the decantate for testing wherever designated – the liquid might have cations present!
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