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Using variables in ICE tables

Posted: Sun Jan 13, 2019 11:21 am
by Schuyler_Howell_4D
Can someone explain when you should use variables such as X in an ICE table versus finding the change based on stoichiometric coefficients before being plugged into the table?

In one of the Audio-Visual Learning Modules (I think equilibrium part 2) Dr.Lavelle went ahead and used mole ratios to find the change of each product and each reactant before using the table. I understand that using the variables in the table is essentially using the mole ratios but just without actual values at first but, still, when should we use each approach?

Re: Using variables in ICE tables

Posted: Sun Jan 13, 2019 11:26 am
by Mahir_Hasan2C
It's much easier cause x can be anything thus it is used to define the change in molarity. It also makes things easier in the algebraic sense. Then we put whatever coefficient in front of x to display the conservation of matter. For example, if 1 reactant produced 2 product we would have -x and +2x because 1mole of reactant would always produce 2 moles of product.

Re: Using variables in ICE tables

Posted: Sun Jan 13, 2019 12:05 pm
by Porus_Karwa_2E
To add onto the above comment the X variable is much easier to use as after you are done assigning variables we would just need to use the quadratic equation.