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The point of an ice chart is it gives you a way to organize and see how a reaction affects the concentration of reactants and product. It is used when we cannot assume a reaction goes to "100% completion". If you have the final resulting value of the reaction, you can find C by doing initial - final. If you do not have the resulting value, you assign x to be the value of change of any specific reactant and then also write out how much of the values of other substances change with regards to x. So for example, say we have the reaction A+2B -> 3C. We could write that the concentration of A changes by a value of x. However, since when one A molecule reacts with 2 molecules of B, the change in concentration of B is 2x. When one molecule of A reacts, 3 molecules of C form as we can tell because of the coefficient in front of C (I think that's the term?). Now that we know A changes by value of X, we can now write the change part of the RICE table as [A]-X since the concentration of A is decreasing by X amount. B would be [B]-2X and C would be [C]+3X (it's addition since more c is being made).
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