a. 100 g of NaNO; dissolved in 100 g of water at 30°C
b. 30 g of KCIO; dissolved in 50 g of water at 50°C
c. 90 g of KNO dissolved in 100 g of water at 60°C
d. 110 g of KCI dissolved in 200 g of water at 80°C
e. What mass in grams of KNO; are needed to prepare
a saturated solution in 100 g of water at 50°C?
To determine which of the given solutions are unsaturated, saturated, or supersaturated, we need to calculate the solubility of each solute at the given temperature and compare it to the amount dissolved in the solution.
a. NaNO3 dissolved in water at 30°C:
The solubility of NaNO3 in water at 30°C is approximately 140 g/100 g of water.
Since only 100 g of NaNO3 is dissolved in 100 g of water, this solution is unsaturated.
b. KClO3 dissolved in water at 50°C:
The solubility of KClO3 in water at 50°C is approximately 60 g/100 g of water.
Since only 30 g of KClO3 is dissolved in 50 g of water, this solution is unsaturated.
c. KNO3 dissolved in water at 60°C:
The solubility of KNO3 in water at 60°C is approximately 110 g/100 g of water.
Since 90 g of KNO3 is dissolved in 100 g of water, this solution is unsaturated.
d. KCl dissolved in water at 80°C:
The solubility of KCl in water at 80°C is approximately 56 g/100 g of water.
Since 110 g of KCl is dissolved in 200 g of water, this solution is saturated.
e. To prepare a saturated solution of KNO3 in water at 50°C:
The solubility of KNO3 in water at 50°C is approximately 50 g/100 g of water.
Therefore, to prepare a saturated solution in 100 g of water at 50°C, you would need to dissolve 50 g of KNO3.