Does water/ or solid have concentration?

[mcato_O]

does water/ or solid have concentration?

does water/ or solid have concentration?
Why do we just ignore the concentration of solid or solution solvent and replace it as one M? I always thought the reason is because the concentration of solid or water solvent does not change much so in practice we just move it to the Kc side” such as Kw = Kc[H2O]=[H][OH]? Now I am not so sure

 

[iansmith]

there already a thread started about it
https://www.physicsforums.com/showthread.php?t=118776

 

[ravenprp]

Yes, both water and solids can have concentration. Concentration refers to the amount of a substance present in a given volume or mass. In the case of water, its concentration can be measured in terms of its density (mass per unit volume) or molarity (moles per liter). Solids can also have concentration, which is typically measured in terms of mass per unit volume or molarity.

In certain chemical reactions, the concentration of water or solid may not change significantly and therefore can be considered to have a constant concentration. In these cases, the concentration is often ignored and replaced with a single value in the equilibrium constant expression. This is because the concentration of a constant species does not affect the equilibrium and can be factored out of the equation.

However, it is important to note that in some reactions, the concentration of water or solid may play a significant role and cannot be ignored. In these cases, the concentration must be taken into account in the equilibrium constant expression.

In summary, both water and solids can have concentration and their role in equilibrium reactions depends on the specific reaction and conditions.