Answer
Boiling-point elevation describes the phenomenon that the boiling point of a liquid (a solvent) will be higher when another compound is added. Ca(NO$_3$)$_2$ thus has the higher boiling point.
Work Step by Step
Boiling-point elevation describes the phenomenon that the boiling point of a liquid (a solvent) will be higher when another compound is added. Ca(NO$_3$)$_2$ thus has the higher boiling point.