Question

Based on Reference Table I, which change occurs when pellets of solid NaOH are added to water and stirred?

Answer 1

If NaOH pellets are added to water and stirred, the solution temperature is increased. This is because the reaction of NaOH and water is exothermic, therefore, releasing heat. The delta H is a positive number. If the reaction is endothermic which absorbs heat, delta H is a negative number.