solids in calculating equilibrium constant? [ENDORSED]

[josephyim1L]

Are solids included in the calculation for the equilibrium constant when using partial pressure?

[Cienna Henry 1J]

No, pure solids and liquids are excluded in the calculation

[Edward Xie 2E]

As Dr. Lavelle said,

Molar concentration of a pure substance (solid or liquid) does not change in a reaction
∴ solids and liquids are not included in K expression

[Sydney Tay 2B]

Pure solids and liquids are not included in calculating the equilibrium constant, but aqueous solutions and gases are included.

[Edward Suarez 1I]

only aq and g solutions are included in the equation (and g is in partial pressure)

[uhedlund]

No, only aqueous solutions and gases are included in calculating the equilibrium constant.

[Luc Lorain 1L]

only aq and g solutions are included in the equation (and g is in partial pressure)

It should also be expanded that when reactions are completed in a fixed volume container, the addition of noble (inert) gases does not affect equilibrium for similar reasons as pure solids and liquids: they do not affect the concentration of reactant/product.

[allisoncarr1i]

Does anyone know why they are not included or is it not necessary to know why?

[Yiting_Gong_4L]

Solids and liquids are NOT included when calculating the equilibrium constant because a solids concentration would be 100% which is just 1 and doesn't affect the answer.
Only aqueous solutions and gases are included in the calculation of the equilibrium constant.