when given all initial values

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Dahriel Aron 3A
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Joined: Fri Sep 25, 2015 3:00 am

when given all initial values

Postby Dahriel Aron 3A » Wed Dec 02, 2015 2:18 pm

When you are given all of the initial concentrations for an equation, is it safe to always just calculate the Q and compare it to the K to determine which way the reaction is going? I remember Professor Lavelle saying in office hours that this strategy does not always work and that sometimes we should convert the products into reactants instead. Does anyone know why this method would not sometimes work or how we would know to use the method of converting products to reactants instead?

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Re: when given all initial values

Postby Chem_Mod » Wed Dec 02, 2015 4:31 pm

Calculating Q and comparing it to K to determine the direction of change will always work in principle. There is an homework problem though where instead of doing this, they converted the products to as many reactants as possible, since K was very small. Either method will work.

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