Pre-lab 4 : Cobalt(II) Complexes & Le Chatlier’s Principle

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7 Terms

1
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Express the equilibrium constant for today’s reaction:

Co(H2O)6 +2 (aq) + 4Cl- (aq) ← → CoCl4–2 (aq) + 6H2O(l)

[CoCl4]-2/ [Co(H2O)6]+2 (Cl)4

2
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An equilibrium constant with a large magnitude indicates that:

Reaction favors products

3
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An equilibrium constant with a low magnitude indicates that:

Reaction favors tarting materials

4
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Why and how does adding AgNO3 solution affect the equilibrium (referring the equation in Question #1)

AgNO3 + Cl- ← → AgCl(s) + NO3-

5
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The pink color in this experiment confirms that presence of:

Co(H2O)6+2 ions

6
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Is this reaction endothermic or exothermic?

Endothermic

7
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Select the statement that best describes a system at equilibrium?

As soon as product molecules form, other molecules of product become reactants

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