If the dissolution of borax in water is spontaneous, the change in enthalpy will be both positive and negative. It can be predicted by the sign of the enthalpy change depending on the temperature.
Borax is a hydrated borate of sodium. It is a salt. When borax is mixed in water, it is converted into boric acid and the pH will be 9.13.
Enthalpy is a total heat energy present in a closed system, also called a thermodynamic system.
Thus, the change in enthalpy will be of both signs. Predicted by the sign of the change in temperature.
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