I am a high school student and I am very confused in Equilibrium expression, My confusion is that "Why we don't write concentration of solids and pure liquids in equilibrium expression?" Many people says that its because their concentration don't changes but how does it related to this? If concentration is same for them then what's the issue in it? I am not able to picturize how does it affect the equilibrium expression if their concentration remain the same?
please Help me regarding this using simple language that I can understand because I am at high school level. If anyone could help me to picturize this thing in my mind then it would be very helpful.