Using Ice Tables: When to Use X

[merry]

When do you use an unknown (x) as the change in the concentration of the entities and when do you simply subtract the concentration of the limiting reagent from the initial concentration of the reactants? @.@
Thanks!

 

[Borek]

When do you use an unknown (x) as the change in the concentration of the entities and when do you simply subtract the concentration of the limiting reagent from the initial concentration of the reactants?

I hope I understand your question correctly, it would be easier if you will give an example.

If you treat something as a limiting reagent it means that for some reason you assume equilibrium in the reaction is shifted so far to the right, that concentration of the limiting reagent in the mixture is so low, it can be ignored in mass balance.

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methods