00:01
Okay, so for this question, we're going to be using the example of glucose, and you can imagine that forms an equilibrium when you add it to water with c6.
00:14
6 .6.
00:18
A .q.
00:19
All right.
00:20
So, at the very start, when we have pure water and we're adding glucose to it, delta g is going to be less than zero, right? which means equilibrium shifts.
00:42
And this is an unsaturated solution.
00:51
Okay, so in this regime, let's say glucose is like 900 grams per liter or something.
01:00
So let's say you just add a little bit of glucose to water.
01:03
It's all going to dissolve, but we're going to run out of the solid, right? if we ran out of the solid, that means the equilibrium still wants to move to the right, but it can't because we don't have any more things to dissolve.
01:15
And this is what we'll call an unsaturated solution.
01:17
So let's say we keep adding glucose and it keeps dissolving and we add just enough that the last little piece we had, let's say, doesn't dissolve.
01:28
So at that point, at that exact moment, the derivative of free energy change is going to be zero...