2. Actions
Stirring ensures complete dissolution.
Enthalpy of Solution ($\Delta H_{soln}$)
The energy change when 1 mole of substance dissolves in a solvent. It is the sum of Lattice Energy (breaking crystal) and Hydration Energy (forming bonds with water).
Exothermic
$\Delta H < 0$
Temp Rises
Endothermic
$\Delta H > 0$
Temp Falls
Calculation
$$ q = m \cdot c \cdot \Delta T $$
- $m$: Mass of solution (~100g)
- $c$: Specific heat ($4.18 J/g^\circ C$)
- $\Delta T$: $T_{final} - T_{initial}$