Chemical Equilibrium

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Kassandra Molina 2B
Posts: 43
Joined: Wed Nov 16, 2016 3:03 am

Chemical Equilibrium

Postby Kassandra Molina 2B » Wed Nov 22, 2017 1:18 am

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?

Kamryn Chang 1I
Posts: 20
Joined: Fri Sep 29, 2017 7:04 am

Re: Chemical Equilibrium

Postby Kamryn Chang 1I » Wed Nov 22, 2017 1:54 am

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.

Naveed Zaman 1C
Posts: 62
Joined: Fri Sep 29, 2017 7:04 am
Been upvoted: 2 times

Re: Chemical Equilibrium

Postby Naveed Zaman 1C » Wed Nov 22, 2017 11:34 am

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.

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