Potassium nitrate has a solubility of 32 g of KNO3 in 100 g of H2O at 20 °C. State if each of the following forms an unsaturated or saturated solution at 20 °C:
a. 32 g of KNO3 and 200. g of H2O
b. 19 g of KNO3 and 50. g of H2O
c. 68 g of KNO3 and 150. g of H2O
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