How Does The Amount Of Salt Affect The Freezing Point Of Water

The purpose of my experiment was to determine how the amount of salt affects the freezing point of water. My hypothesis was if I increase the amount of salt distributed in cups of water, then the freezing point of the water will decrease because salt dissolves in water while taking up volume simultaneously, which prevents water molecules from packing together and freezing. I tested my hypothesis by filling 16 nine ounce plastic cups with six ounces of water each. I then added one teaspoon of salt to five cups of water, two teaspoons of salt to five different cups of water and three teaspoons of salt to five different cups of water. I left one cup of water without salt because this cup was my controlled variable. I regularly checked on the cups of water every 10 minutes and recorded the temperature of any cup that had ice formed on the top.

When three teaspoons of salt were added to water, the average freezing point was 22.2°F. The relationship between the amount of salt added to water and the freezing point of water was as the amount of salt increased, the freezing point decreased. My hypothesis was supported by my data because the average freezing point of the water with three teaspoons of salt was 5.8°F less than the average freezing point of water with one teaspoon of salt. My results concluded that increasing the amount of salt added to water decreases the freezing point of that water. Another question I would like to ask is how does the amount of salt affect the boiling point of