Selective Precipitation - Winston Knoll Collegiate Page 2

Try a similar flow chart for the following cations: Ba 2+ , Fe 2+ , Hg 2 2+

Ba 2+

Fe 2+

Hg 2 2+

For the above example, a chemist could prepare a solution containing all three

cations if ionic solids are used that contain anions that are always soluble.

What anions are always soluble?

What cations are always soluble?

Note: All substances are soluble to some extent. Tables are prepared using

specific concentration values that classify substances as soluble, slightly soluble

or insoluble. We will consider later in the semester the true solubility of

substances considered “insoluble” in this section, when we discuss Ksp

concepts.

Complete the analysis and create a selective precipitation flowchart for the

following combination of aqueous ions.

1) Cu 2+ , NH 4 + , Ca 2+ , Mg 2+

2) Cl - , S 2- , SO 4 2- , CH 3 COO -

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