190 grams of potassium iodide is placed in 100 cm3 at 60 degrees Celsius. the solution is cooled to 30 degrees Celsius. how many grams will settle out?

Answer 1

Find the Ksp of KI at 30C.

Ksp = [K{+}]*[I{-}]

That will determine the mole concentration of dissolved KI. Multiply by volume (in L) and molecular mass to determine the mass. Subtract that from the mass of supersaturated KI to determine the mass of precipitate.

Answer 2

We need the solubility of KI at 60 C and at 30 C in order to help you. I expect you have that info either in the problem or in a table. Supply that info for us to help.