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C means the "Change" in a reaction. You will use stoichiometry to figure out these values.From the problems we've done in the textbook, we use "x" to define the change since we don't know the concentration difference from initial to equilibrium. Then, use products over reactants equal to the equilibrium constant.
You can calculate the C expression by combining the initial and change together. Then to find the value of the variable x in the C expression, you set all the expressions in the C category into the equilibrium constant form where products is over reactants and set it equal to the equilibrium constant. Finally, all you do is solve for x and plug it back in to find the concentrations of the species. Yes, C does stand for change.
So you probably already know that the "c" value stands for "change in equilibrium". In most problems, you typically use -x for the reactants, and +x for the products. This gives you an equation for the "e" part of the ICE table, which you can then use the K value to solve for x. In certain cases you will have to use ICE tables to solve for a K value (very rare). In this case, you typically know the change as it is given to you in the problem.
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