Devin investigated whether salt reduces the boiling point of water. She poured 1 gallon of 18 degrees Celsius (°C) water into a pot and added 2 cups of salt to it. Devin heated it over a fixed
flame and measured the temperature when the water reached a rolling boil. She repeated the
experiment with 1 gallon of water and 4 cups of salt under identical conditions. Where did Devin
make a mistake in her experimental design?