A glass of water is exposed to a reservoir of two ideal gasses A and B, which can be absorbed into the water in two different ways.

State ????: Under some partial pressures of the components (i.e. ???? , ???? ), there are low concentrations ???????? and ???????? of the A and B species in the water.
State ????: At other partial pressures of the components, essentially only component A is dissolved into the water at a relatively high concentration ????????, with ???????? = 0.
Noting that the partial pressure is related to the chemical potential of a species (e.g. ???? = ???? + ????????ln???? ), sketch a ???? -???? phase diagram for this system. ????????,0 ???? ????????.