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HOW CAN ΔHº, ΔGº, AND ΔSº BE DETERMINED FOR A REACTION? INTRODUCTION In the 1960s, there was a TV show, hosted by Ronald Reagan, that was sponsored by “20-Mule Team Borax” (see https://www.youtube.com/watch?v=qC0H6mPyfZA). The product is still being sold (see https://www.20muleteamlaundry.com/). It is added to laundry detergent to increase its ability to clean dirty clothes. The name of the product comes from the fact that one of the largest deposits of borax in the world was discovered in Death Valley in the late 1800s. From 1883 to 1889 there was no way to ship ore from this borax mine to the nearest railway in Mojave, except by mule train across 165 miles of desert. It took 16 days, 18 mules and 2 horses to carry 37.5 tons of ore and water across this desert. The formula for borax is often written as Na2B4O7 • 10H2O, but this is slightly misleading. Two of the water molecules are part of the molecular formula of the B4O5(OH)42- ion that lies at the heart of this compound, and the other eight water molecules are trapped in holes in the crystal. Thus, we might write the formula for borax as Na2B4O5(OH)4 • 8H2O and illustrate the molecular structure of the B4O5(OH)42- ion as follows: THE SOLUBILITY PRODUCT EQUILIBRIUM FOR BORAX IN WATER Borax is sparingly soluble in water, dissolving to form the Na+ and B4O5(OH)42- ions, and releasing the eight hydrated water molecules into the solution.
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