[Ice-cream]

for equilibrium constants, when K<1, the reactants are favoured, when K>1 the products are favoured and when K=1...what happens?

[angelguy]

It means that the gibbs energy change between the reactant and the product is zero. Which is why k =1 as in del G = -RTlnK.

Thanks,
angelguy

[Juan R.]

For

A <--> B

in the concentration approx.

K = C_B/C_A

for K = 1, C_B = C_A. There is not preference between reactants and products. Both are equally "stable".

An "trivial" example is ammonia inversion

          H \
A =    H - N:
          H /

            / H
B =    :N - H
            \ H