Potassium nitrate has a solubility of 32 g of KNO3in 100 g of H2O at 20 ?C. Dete

Question

Potassium nitrate has a solubility of 32 g of KNO3in 100 g of H2O at 20 ?C. Determine if each of the following forms unsaturated or saturated solution at 20 ?C:

1.) adding 21 g of NaNO3 to 50. g of H2O (saturated or unsaturated?)

2.) adding 68 g of NaNO3 to 150. g of H2O (saturated or unsaturated?)

Potassium nitrate has a solubility of 32 g of KNO3in 100 g of H2O at 20 ?C. Determine if each of the following forms unsaturated or saturated solution at 20 ?C:

1.) adding 21 g of NaNO3 to 50. g of H2O (saturated or unsaturated?)

2.) adding 68 g of NaNO3 to 150. g of H2O (saturated or unsaturated?)

Explanation / Answer

solubility = 32 g KNO3 / 100 g water = 0.32 g KNO3 per gram water

a)

21 g NaNO3 in 50 g water means,

concentration = 21 g NaNO3/50 g water = 0.42 g NaNO3 per gram of water.

Since concentration is greater than solubility, it is saturated solution

b)

68 g NaNO3 in 150 g water means,

concentration = 68 g NaNO3/150 g water = 0.45 g NaNO3 per gram of water.

Since concentration is more than solubility, it is also saturated solution

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