A mass of 80 g of #KNO_3# is dissolved in 100 g of water at 50°C. The solution is heated to 70°C. How many more grams of potassium nitrate must be added to make the solution saturated?
Saturation describes an equilibrium condition, where there is equilibrium between dissolved and undissolved solute. This table contains the requisite data. And when you have figured it out, would you repost your answer here?