Answer:
The freezing point of a solution can be lower or higher than the normal freezing point of water, depending on the properties of the solute.
In the case of a 1.0 M solution of KNO3 (potassium nitrate) in water, the freezing point will be lower than 0.0 °C. This is because KNO3 is a solute that forms ions in water, which lowers the freezing point of the solution.
Among the given options:
A. -0.6 °C is a possible freezing point for the KNO3 solution, as it is lower than the normal freezing point of water.
B. 100.6 °C is not a possible freezing point for the KNO3 solution, as it is higher than the boiling point of water.
C. 0.6 °C is also not a possible freezing point for the KNO3 solution, as it is equal to the normal freezing point of water.
Therefore, the correct answer is:
A. -0.6 °C is a possible freezing point for a 1.0 M solution of KNO3 in water.
Step-by-step explanation: