Chemistry => Solutions => Solubility
It presents us with a solubility graph. This type of graph allows us to know how many grams of solute can be dissolved in 100 g of water depending on the temperature of the solution.
The lines on the graph represent the saturation points, that is when the solution is saturated. Below the line the solution is unsaturated and above the line, the solution is supersaturated and a precipitate will appear in the solution.
Now, to find the substance that reaches saturation with the given conditions, we are going to mark the points mentioned on the graph, we will have:
Marking 20°C on the temperature axis and 145 grams of solute on the y axis, we have that it intersects with the line of substances KI.
It means that KI reaches saturation at 145 grams of solute per 100 grams of water at 20°C.
Answer: KI
