Separation and Identification of Group C Cations - Foothill College
Separation and Identification of Group C Cations - Foothill College
Separation and Identification of Group C Cations - Foothill College
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<strong>Foothill</strong> <strong>College</strong>-Chemistry 1C<br />
Prelab Exercise:<br />
1. Explain why flame tests are necessary in the <strong>Group</strong> C analysis.<br />
Name:<br />
Qualitative Analysis <strong>Group</strong> C<br />
2. To help you determine a proposed separation <strong>and</strong> identification scheme for the <strong>Group</strong> C cations, answer the following<br />
questions:<br />
a) Refering to Table 2 in the Introduction to Qualitative Analysis, list K sp values for the hydroxide, oxalate, sulfate <strong>and</strong><br />
carbonate salts <strong>of</strong> the <strong>Group</strong> C cations. Organize your values in table form below.<br />
b) Now study the solubilites <strong>of</strong> the <strong>Group</strong> D cations, referring again to Table 2 <strong>of</strong> the Introduction to Qualitative<br />
Analysis. Which <strong>of</strong> the anion(s) listed in part (a) could possibly be used to selectively precipitate the <strong>Group</strong> C<br />
cations while leaving the <strong>Group</strong> D cations in solution?<br />
c) Now write the solubility rule given for sulfates in Table 3 <strong>of</strong> the Introduction to Qualitative Analysis.<br />
d) Now write the solubility rule given for oxalates in Table 3 <strong>of</strong> the Introduction to Qualitative Analysis.<br />
Dr. L.J. Larson 3 June 27, 2008<br />
Qual<strong>Group</strong>C.doc