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A+ Solution UOP CHM/150 Qualitative Cation Tests Lab

Qualitative Cation Tests

Peter Jeschofnig, Ph.D. Version 42-0194-00-01

Lab Report Assistant

This document is not meant to be a substitute for a formal laboratory report. The Lab Report Assistant is simply a summary of the experiment’s questions, diagrams if needed, and data tables that should be addressed in a formal lab report. The intent is to facilitate students’ writing of lab reports by providing this information in an editable file which can be sent to an instructor.

Observations

Data Table: Qualitative Cation Tests

Name

Test Tube 1 (HCl)

NH3
Test Tube 2 (NaOH)

Excess
Aluminum 3+

Ammonium +

Calcium 2+

Copper 2+

Iron 3+

Lead 2+

Silver +

Zinc 2+

Name

Test Tube 3 (NH3)

Excess
Test Tube 4
confirmation
Aluminum 3+

Ammonium +

Calcium 2+

Copper 2+

Iron 3+

Lead 2+

Silver +

Zinc 2+

Questions

A. Write net ionic equations for all reactions that produce a precipitate.

B. Identify the cations that precipitate with hydrochloric acid and dissolve in the presence of ammonia.

C. Identify the cations that precipitate with hydrochloric acid and do not redissolve in the presence of ammonia.

D. Identify the cations that precipitate upon addition of two or three drops of sodium hydroxide but redissolve upon addition of excess sodium hydroxide.

E. Identify the cations that precipitate upon addition of two or three drops of sodium hydroxide and are not affected by additional sodium hydroxide.

F. Identify the cations that precipitate upon addition of two or three drops of aqueous ammonia but redissolve upon addition of excess aqueous ammonia.

G. Identify the cations that precipitate upon addition of two or three drops of aqueous ammonia and are not affected by additional aqueous ammonia.

H. What simple test would distinguish Ag+ and Cu2+

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