ICE Table [ENDORSED]

Posts: 91
Joined: Fri Sep 28, 2018 12:16 am

ICE Table

When computing the value of x in ICE tables, using the moles of products and reactants: do subscripts matter? Or does x strictly come from the stoichiometric coefficient?

Fayez Kanj
Posts: 62
Joined: Fri Sep 28, 2018 12:18 am
Been upvoted: 1 time

Re: ICE Table

Hello,

No, the subscripts do not matter for calculating the changes in concentration "x." Only the stoichiometric coefficients determine the values of x. For example, if 1 mol of reactant forms 2 moles of products, then the change for reactant concentration is -x, and the change in product concentration is +2x.

Hope this helps :)

JacobHershenhouse3G
Posts: 32
Joined: Thu Jan 10, 2019 12:17 am

Re: ICE Table  [ENDORSED]

Be careful here! You are using concentration values, not molar values when you are plugging values into the ICE table as you solve for x. This is because the end goal is the equilibrium concentrations of reactants and products, not the number of moles. Yet, you have the right idea using the stoichiometric coefficients to relate how the concentrations change in that C column of your table. We can use these coefficients because moles and concentration are proportional awhen volume is constant.

Courtney McHargue 1I
Posts: 56
Joined: Fri Sep 28, 2018 12:17 am

Re: ICE Table

The subscripts don't matter in the ice table, only the coefficients before the molecules of product or reactant affect the change in molarity in the ice table calculations and the powers the molarities are to in the final equilibrium constant calculation.

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