What is the solubility of cerium sulfote at 10 deg C? What is the solubility of cerium sulfate at 50 deg C?
The solubilities at 10 °C and 50 °C are 14 g/100 mL water and 6 g/100 mL water, respectively.
I presume that your instructor is asking you to interpret a solubility graph like the one below.
(From Prairie South)
Cerium(III) sulfate is one of the few solids that is less soluble in water at higher temperatures.
It appears that 100 g of water will dissolve 14 g of the salt at 10 °C and only 6 g
at 50 °C.