Question

an aqueous solution is saturated in both oxygen gas and potassium iodide at 80 °c. determine what happens when the solution is cooled to room temperature.

Explanation:

Step1: Consider gas solubility

The solubility of a gas in a liquid increases with decreasing temperature. So, as the solution is cooled from 80°C to room - temperature, the solubility of oxygen gas increases and no oxygen gas will bubble out.

Step2: Consider salt solubility

The solubility of potassium iodide in water generally decreases with decreasing temperature. When the saturated solution of potassium iodide at 80°C is cooled to room - temperature, potassium iodide will crystallize out of the solution since the solubility of KI at room - temperature is lower than at 80°C.

Answer:

Potassium iodide will crystallize out of the solution, and no oxygen gas will bubble out.