There's a relationship between chemical equilibrium and thermodynamics that we're not going into in this unit, but you'll see these connections later on. But you might notice some similarities in this following section, in that two different equilibria can be used to garner information about a third equilibrium for which you don't have direct information. The framework in the process for doing this bears some striking resemblances to Hess's law, and ultimately you'll see that these two concepts are in fact related.