Answer:
The solubility graph is a very useful tool because it tells you the amount of potassium nitrate that can be dissolved per
100 mL
of water in order to have a saturated solution of potassium nitrate at a given temperature.
In order to find the solubility of the salt at
60
∘
C
, start from the
60
∘
C
mark on the graph and move up until you intersect the curve. At the point of intersection, move left until you intersect the
y
axis and read off the value that you land on.
In this case, you can estimate that the solubility of potassium nitrate in water at
60
∘
C
is equal to about