Teachers Guide for Chemistry : An Experimental Science
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What is the effect of adding some addi- tional S0 2 (g) after the system has reached equilibrium? Answer The addition of more S0 2 (g) destroys the existing equilibrium, causing the system to change; the SO z (g) concentration is increased, and the 2 (g) concentration is decreased until a new equilibrium is estab- lished. 3. If the pressure of the system is increased by reducing the volume (temperature and amounts of gases remaining constant) the pressure of each component goes up. How will the... equilibrium shift, and what further effect will this have on the S0 3 (g) con- centration? Why? Answer The S0 3 (g) concentration would be still higher after the new equilibrium is estab- lished. According to Le Chatelier's Prin- ciple, the system will shift to compensate for the disturbing factor. In this situa- tion, increasing the pressure favors the reaction which tends to reduce the pres- sure. Relatively speaking, there are 1 \ vol- umes of reactants to one volume of prod- uct. The formation of more S0 3 fgj would have the effect of relieving some of the added pressure but increases the S0 3 (g) pressure still more.
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