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General Chemistry Principles, Patterns, and Applications, 2011

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these complexes is octahedral; in the other, it is tetrahedral. What reaction occurs to produce the color<br />

change? Write a balanced chemical equation for this reaction, indicating the species present.<br />

14. A platinum complex that is widely available commercially is chloroplatinic acid {H 2 [PtCl 6 ]}, which is used to<br />

make platinized asbestos, a catalyst. What is the structure of chloroplatinic acid? Is it distorted from an<br />

idealized geometry? Do you expect it to be colored? Justify your answers.<br />

A N S W E R S<br />

1. The tungsten bronzes can be viewed as the products of partial reduction of WO 3 by an active metal to give a<br />

mixture of W(VI) <strong>and</strong> W(V). In the solid, the d orbitals of the metal overlap to form a partially filled b<strong>and</strong>,<br />

which is responsible for the luster <strong>and</strong> metallic conductivity.<br />

2.<br />

3.<br />

4.<br />

5.<br />

6.<br />

7.<br />

8.<br />

9.<br />

a. Pt; it can oxidize ammonia to NO, so it should be able to reduce NO x as well.<br />

b. Ni; it has a low affinity for S <strong>and</strong> is hard to oxidize about the +2 state.<br />

c. FeCl 3 ; it catalyzes the formation of NH 3 from the elements, so it must also catalyze its<br />

decomposition.<br />

d. MnO 2 ; this is a well-known catalyst for decomposition of KClO 3 <strong>and</strong> has been mentioned<br />

several times in the text.<br />

Saylor URL: http://www.saylor.org/books<br />

Saylor.org<br />

2200

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