Borax, sodium tetraborate decahydrate, is an important mineral found in dry lakebeds in California. It is used to make soap and glass, and used as a preservative. You can use the values of Ksp of borax at different temperatures to determine H, S, and G for the dissolution of borax:

has the form of a linear equation y = mx + b, where y is the ln Ksp and x is 1/T. The slope is equal to (H/R), and the y intercept is S/R, where R is the gas constant, 8.314 J/K mol. If you measure Ksp at several different temperatures, you can plot the ln K versus 1/T (T in kelvin) as shown here.