Acidity Constants

[Mao]

Hence, the new equilibrium is equal to :



Prove, or prove incorrect, that , using the fact that: and that , and are positive constants.

Leave this for the maths guys.

lol, you might as well already done it yourself:





since ,



yay, math works.

:. God exists

[Pandemonium]

Jesus, such a non sequitur statement to make.

[bucket]

I should have listened in class :S.

When using an example with HCl, the book stated this:
"Since water is the solvent in aqueous solution and its concentration is virtually constant we write the equilibrium expression as
"

Why is the concentration of water constant?? Is this related to K_W?

[Collin Li]

It's constant because things like liquids and solids have a set type of structure (roughly, for liquids), and hence a set density. Water, the solvent, is a liquid. Adding another molecule of water is not going to change the concentration (much).

Another way to think of it is because we have heaps of water compared to any other species. In the reaction I'm consuming 1 molecule of water and 1 molecule of hydrochloric acid. Will we experience much change to the concentration of water? No, it'll still be high as, while the change in the hydrochloric acid concentration will be significant. It's sort of like taking 1 from 5, versus taking 1 from a 1 million.

On the other hand, aqueous substances and gases, have very variable concentrations.

[bucket]

ahhhh thanks a million coblin =]