Concept Test 4

Internet Concept Test Chemistry 22
Prof. J. C. Baird
Marn-Yee Lee, Silvia Georges, Derek Cummings
Topic: Equilibrium and LeChatlier's Principle

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Up to 4 people can work together on this test.

There are 2 questions.

Background material. It is not necessary to read this.

Here is a link to a brief discussion of LeChatlier's Principle from UCSD.

The Problem:
Cobalt(II) ion forms a stable colored complex with chloride ion that is blue. If the chloride ligands are replaced by water molecules around the Co(II), the complex with water becomes pink. This is used as an indicator for moisture, however, we will use this as an illustration of equilibrium and Le Chatlier's Principle. The following equation represents the equilibrium reaction with the cobalt (II) compounds.

Question 1

If the solution is Pink then the Equilibrium constant for the reaction as written is:

Reason for Answer:

Question 2

When HCl, as a source of chloride ion, and acetone to soak up water, are added to the Pink equilibrium mixture the reaction will:

Shift to the left becomming more pink.

Shift to the left becomming more blue.

Shift to the right becomming more pink.

Shift to the right becomming more blue.

Reason for Answer:

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