Let's say we have solute a, which is highly concentrated (let's say 99%?) on side 1 of a semipermeable membrane.
We also have solute b, which is has a much lower concentration (let's say 0.01%) on side 2 of a semipermeable membrane.
If we allow these two solutes to diffuse across a semi-permeable membrane that permits both, my reading seems to suggest that we would eventually expect 50% of solute a to occur on side 1 and 50% on side 2. We would also expect 50% of solute b to occur on side 1 and 50% on side 2.
I'm not sure that I understand this.
I completely agree that 50% of the a+b molecules will end up on side 1 and 50% of a+b will end up on side 2.
But I don't understand why different solutes travel along their own concentration gradients independent of other solutes in solution. Why would they not interact with the other solute?
Perhaps they do, and the diffusion kinetics of solute a would dictate that it reaches equilibrium much faster than solute b?
Would it be correct to predict that the larger the difference in initial global concentration, the longer the lag between when "a" reaches equilibrium vs. when "b" reaches equilibrium?