Answer:
Explanation: As you can see, potassium nitrate has s solubility of about
67 g / 100g H
2
O
at
40
∘
C
. This means that at
40
∘
C
, a saturated potassium nitrate solution will contain
67 g
of dissolved salt for every
10 0g
of water.
You know that at this temperature, your solution contains
35 g
of potassium nitrate in
100 g
of water. This solution will be unsaturated because it contains less potassium nitrate than the maximum amount that can be dissolved.
In order to make a saturated solution, you must get the total mass of potassium nitrate to
67 g
, which means that you must add
mass of KNO
3
a
to be added
=
67 g
−
35 g
=
∣
∣
∣
∣
¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯
a
a
32 g
a
a
∣
∣
−−−−−−−−
