Liquids in Equilibrium Constants? (1 Viewer)

[kapitanvicki]

Besides solids, are there any other restrictions (on the physical state of the substance) placed on equilibrium expression Kc calculations? I was told that aqueous substances can be included but NOT liquids (e.g. water and concentrated acids) but my textbook did accept water in determining Kc. Thanks!

 

[nat_doc]

did they put the [water]=1? becuase the concentration of liquid water never changes.... try compressing water.

 

[MetroMattums]

Solids and liquids cannot be used for equilibrium calculations - in an aqueous solution the concentration of water is assumed constant regardless ([H2O] = 1)

 

[Pwnage101]

Yes, this is quite intuitive - we are somewhat measureing concentration or pressure - Liquids and Solids have no 'concentration" since they are pure, but aq and g substances do, since a gas is a part of other gases in the room, while in aq state, the ubstance is dissolve in water, and so has some concentration.