Liquids and Solids in Equilibrium Constants

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Amy Lefley 1J
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Liquids and Solids in Equilibrium Constants

Postby Amy Lefley 1J » Thu Jan 10, 2019 9:27 pm

I know that we do not include solids and liquids when calculating the equilibrium constant because they do not have concentrations, but even if they do not have concentrations, don't they still affect the equilibrium?

Chem_Mod
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Re: Liquids and Solids in Equilibrium Constants

Postby Chem_Mod » Thu Jan 10, 2019 9:34 pm

The change of concentration for solid and liquid are so small so that they can be neglected.

004932366
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Re: Liquids and Solids in Equilibrium Constants

Postby 004932366 » Thu Jan 10, 2019 10:22 pm

A good example of this can be found in an example given during lecture in which we are required to find Kp for CaC03(s)-->/<-- CaO(s) +CO2(s). The ratio for the equilibrium constant would be Kp= P(partial pressure of)(CO2) because solids or liquids have such an irrelevant change in concentration that there is no point in adding them to the ratio for the Kp or Kc calculation.

Zubair Ahmed 1L
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Re: Liquids and Solids in Equilibrium Constants

Postby Zubair Ahmed 1L » Fri Jan 11, 2019 10:01 am

The values of the change in concentration of solids and liquids are so small that they can be ignored when solving for the equilibrium constant.

LaurenJuul_1B
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Re: Liquids and Solids in Equilibrium Constants

Postby LaurenJuul_1B » Fri Jan 11, 2019 10:03 am

the change in concentration is too small and can be omitted--only worry about non-pure substances that are aqueous or gaseous

Anmol_cheema_2F
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Re: Liquids and Solids in Equilibrium Constants

Postby Anmol_cheema_2F » Fri Jan 11, 2019 5:14 pm

Their effect is not significant enough to be taken into consideration.


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