3. Can an aqueous solution be prepared that is 30% by mass KNO3 at 20 °C? (Hint:

Question

3. Can an aqueous solution be prepared that is 30% by mass KNO3 at 20 °C? (Hint: use the data from the literature values of the solubility of potassium nitrate.) Explain.
3. Can an aqueous solution be prepared that is 30% by mass KNO3 at 20 °C? (Hint: use the data from the literature values of the solubility of potassium nitrate.) Explain.
3. Can an aqueous solution be prepared that is 30% by mass KNO3 at 20 °C? (Hint: use the data from the literature values of the solubility of potassium nitrate.) Explain.

Explanation / Answer

No , we cannot prepare

the solubility of KNO3 in water at 200  = 316 g /L

30% by mass means 30 g dissolve in 100 g solution.

or

30 g dissolve in 70 g H2O

X g dissolve in 1000 g H2O

X = 1000 x 30 / 70 = 425 g

in 1000 g water (1L) 425 g KNO3 must dissolve but it is not possible according to solubility.

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