Question

Is enthalpy of solution always negative?

Answer 1

1. The amount of heat emitted or absorbed at a constant pressure throughout the dissolving process is referred to as the enthalpy change of solution.
2. Depending on the kind of reaction, the enthalpy of the solution $\left(H_{solution}\right)$ might be positive or negative.
3. When the reaction is endothermic, it is positive; when the reaction is exothermic, it is negative.

Hence, the enthalpy of the solution cannot always be negative.