How can equilibrium be re-established by changing the temperature?
To make the chemical potential of the water in the salt water equal to the chemical potential of the ice again, you’ll have to lower the temperature. The freezing point depression equation T = – kf msolute can be derived from the defining equation for an ideal solution given above, without much trouble. Or you can just look at the graph at right, which shows how the chemical potential of the ice, pure water, and solution water change with temperature.
