Oxygen gas and pure potassium chloride are added to a beaker of distilled water. As the temperature of the water is decreased,

a. the solubility of the oxygen will (increase/decrease).

b. the solubility of the potassium chloride will (increase/decrease). 

A laboratory technician took 100.0 mL of distilled water and added it gradually to a solution of H2 SO4 ^aqh. In the nal solution,

a. the moles of solute (increases / decreases / remains unchanged),

b. the volume of solution (increases / decreases / remains unchanged),

c. and the concentration of solution (increases / decreases / remains unchanged).