Question

Solubility of KNO3 at 313K is 62 gm . what mass of KNO3 would be needed to produce a saturated

solution of KNO3 in 50 gm of water at 313k.​

Answer 1

Explanation:

, you know that potassium nitrate,

KNO

3

, has a solubility of

155 g

per

100 g

of water at

75

∘

C

and of

38.0 g

at

25

∘

C

.

What that means is that at

75

∘

C

, you can dissolve as much as

155 g

of solid potassium nitrate in water without the solution becoming saturated.

Once you hit that

155 g

mark, the solution becomes saturated, which means that the solution can't dissolve any more solid.

Now, the same thing can be said for the solution at

25

∘

C

. At this temperature, dissolving less than

38.0 g

of potassium nitrate per

100 g

of water will result in an unsaturated solution.

At the

38.0 g

mark, the solution will become saturated.

Now, take a look at how the solubility graph for potassium nitrate looks like