The solubility of borax is directly proportional to temperature. Therefore, the sign of H is
A. negative
B. positive
C. unknown with the given information
The answer is B.
I view this as the equation.
borax(s) + heat ==> borax(aq)
Which makes it an endothermic reaction and delta H for the reaction is +.
To determine the sign of the enthalpy change (H) for the solubility of borax, we can use the fact that solubility generally increases with temperature.
When the solubility of a substance increases with temperature, it indicates an endothermic process. Endothermic processes absorb heat from the surroundings, resulting in a positive change in enthalpy (ΔH).
Therefore, the sign of H for the solubility of borax is positive (B. positive).