Solubility

AP Chemistry· difficulty 2/5

Solubility (g/100 g water) for KNO₃ and NaCl is plotted vs temperature.

What does the steep KNO₃ curve indicate?

A
$Dissolution of KNO₃ is exothermic.$
B
$Dissolution of KNO₃ is endothermic.$
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C
$NaCl dissolution is endothermic.$
D
$KNO₃ is insoluble in water.$

Explanation

Solubility increasing strongly with T means heating shifts equilibrium toward dissolved ions. Per Le Châtelier, dissolution is endothermic.

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