You have to show your work. No partial credit for unsubstantiated answers! QUIZ #1 ? 20 minutes March 3, 2010 Name: ____SOLUTION____________________________________ The equilibrium constant for chemical reaction of the type a A + b B c C + d D is defined as follows: where the ?a? terms in the equation represent the ()() ()() b B a A d D c C aa aa K= activities of the various chemical species in the reaction. Assuming ideal behavior (ideal gases and solutions), we saw in class that you can replace activities by measurable quantities. Question 1 For the reaction NH 3(g) NH 3(aq) a) What is the appropriate form of the activities for the chemical species in this reaction assuming ideal behavior? Write the relevant equilibrium constant for the reaction. For NH 3(g) , activity = P NH3 , which is the partial pressure of NH 3 in the gas. For NH 3(aq) , activity is [NH 3(aq) ] in mol/L. Therefore equilibrium constant is: NH3 3(aq) P ][NH K = b) If this reaction is exothermic, what is the effect of increasing temperature on the solubility of NH 3 , and why? Effect of temperature on K is given by equation . ? ? ? ? ? ? 1 For exothermic reaction, ?H<0, and if T 2 >T 1 , right side of equation is negative and K 2
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