Lesson_18_-_Example_Solutions_-2009

# Lesson_18_-_Example_Solutions_-2009 - Lesson 18 Example...

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Lesson 18 Example 18-1 At elevated temperatures, NO 2 reacts with CO according to NO 2 ( g ) + CO( g ) = NO( g ) + CO 2 ( g ) NO 2 has a brownish colour. The other gases taking place in the reaction are colourless. When a gas mixture is prepared at 500 K, in which 3.4 atm is the initial partial pressure of both NO 2 and CO, and 1.4 atm is the partial pressure of both NO and CO 2 , the brown colour of the mixture is observed to fade as the reaction proceeds towards equilibrium. Give a condition that must be satisfied by the equilibrium constant K p under these reaction conditions. Solution: The reaction quotient for these conditions is ( 29 ( 29 ( 29 ( 29 17 . 0 4 . 3 4 . 3 4 . 1 4 . 1 P P P P Q CO 2 NO 2 CO NO = = = Since NO 2 is being consumed (brown colour fades), NO 2 and CO are in excess and Q < K p . Therefore K p > 0.17. 1

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Lesson 18 Example 18-2 Consider the equilibrium Zn ( s ) + Cu 2+ ( aq ) = Cu ( s ) + Zn 2+ ( aq ) with K C = 2x10 37 . What will happen to Cu 2+ and Zn 2+ ions in a solution that is 0.1 M in each but contains no Zn ( s ) or Cu ( s ) when the following are added: a) both Zn( s ) and Cu( s )
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