Question

How do temperature changes lead to solubility changes for salt dissolved in water?(1 point)
Responses

High temperatures mean more of the salt will be in the liquid form as it gradually melts, increasing solubility.
High temperatures mean more of the salt will be in the liquid form as it gradually melts, increasing solubility.

High temperatures mean more kinetic energy, which keeps sodium and chlorine ions from combining, which increases solubility.
High temperatures mean more kinetic energy, which keeps sodium and chlorine ions from combining, which increases solubility.

High temperatures mean more of the salt will be in the gas form, causing it to evaporate out of the solution, decreasing solubility.
High temperatures mean more of the salt will be in the gas form, causing it to evaporate out of the solution, decreasing solubility.

High temperatures mean that sodium and chlorine ions will be moving faster, increasing the odds that they will collide and combine. This reduces solubility.
High temperatures mean that sodium and chlorine ions will be moving faster, increasing the odds that they will collide and combine. This reduces solubility.

Answer 1

Correct choice: "High temperatures mean more kinetic energy, which keeps sodium and chlorine ions from combining, which increases solubility."

Brief explanation: Raising temperature gives water molecules and ions more kinetic energy, which helps overcome the ionic lattice energy and promotes hydration of separated ions, so they stay dissolved rather than recombining. (Note: some salts are exceptions—solubility vs. temperature depends on the enthalpy of dissolution.)