Two Final Thoughts
About Equilibrium Chemistry
We have reviewed and extended our understanding of equilibrium chemistry. We also have developed several
tools for evaluating the composition of a
system at equilibrium. These tools
differ in how accurately they allow us to answer questions involving equilibrium chemistry. They also differ in their ease of use. An important part of having several tools available to you is knowing when to use them. If you need to know whether a reaction is favorable, or the approximate pH of a solution, a ladder diagram
may be sufficient to meet your
needs. On the
other hand, if you
require an accurate estimate of a compoundâ€™s solubility, a rigorous cal- culation using the systematic approach and activity coefficients is necessary.
Finally, a consideration of equilibrium chemistry can only help us decide
what reactions are favorable. Knowing that a reaction is favorable does not guarantee that the reaction will
occur. How fast
a reaction approaches its equilibrium position does not depend on the magnitude
of the equilibrium constant.