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Chemical Equilibrium

Posted: Wed Nov 22, 2017 1:18 am
by Kassandra Molina 2B
When writing the equilibrium constant for a reaction, why do we exclude solids, solvents, and liquids? Are those the only solutions we exclude when writing the equilibrium constant expression?

Re: Chemical Equilibrium

Posted: Wed Nov 22, 2017 1:54 am
by Kamryn Chang 1I
Pure solids and liquids are not included in the equilibrium constant expression because they do not affect the reactant amount at equilibrium in the reaction. Therefore, they are disregarded and excluded from K.

Re: Chemical Equilibrium

Posted: Wed Nov 22, 2017 11:34 am
by Naveed Zaman 1C
Although they are involved in reactions, you don't usually measure the concentration of solids or liquid (when we have an aqueous solution of salt, we say what is the concentration of sodium and chloride ions, but we don't ask for the concentration of water). They don't really have a part to play in the calculation of equilibrium as a result.