(, i need some )
when potassium nitrate is dissolved in water to a cooling notes . one can then conclude that:
a) the solubility of the salt increases with temperature .
b ) the salt is poorly dissociated in water.
c ) the salt solubility decreases with temperature .
d ) the salt dissociated in water is very
e) there is a lowering of the freezing point of water.

c) the salt solubility decreases with temperature.

Salts usually dissolve in water at a given temperature. When water cannot dissolve anymore salt at that same temperature, it is known as a saturation point. With most substances the solubility increases with increase in temperature. Same is the case for a salt like potassium nitrate. With increase in temperature the ability of it to dissolve in water increases. And so with decrease in temperature, the solubility decreases.

Solubility would be your answer.