Which of the following correctly states both the boiling point and freezing point of pure water at 1 atm pressure?

• A. Boiling point: 100 °C, Freezing point: 0 °C
• B. Boiling point: 212 °C, Freezing point: 32 °C
• C. Boiling point: 0 °C, Freezing point: 100 °C
• D. Boiling point: 373 K, Freezing point: 273 K

Answer: (A)

Verified step by step guidance

1. Understand that the boiling point and freezing point of pure water at 1 atm pressure are standard reference points in chemistry.
2. Recall that the boiling point of water is the temperature at which it changes from liquid to gas, which is 100 °C under 1 atm pressure.
3. Recall that the freezing point of water is the temperature at which it changes from liquid to solid, which is 0 °C under 1 atm pressure.
4. Note that temperatures can also be expressed in Kelvin, where the boiling point is 373 K and the freezing point is 273 K, using the conversion formula \(T(K) = T(°C) + 273.15\).
5. Compare the given options to these known values to identify the correct statement of boiling and freezing points of pure water at 1 atm.