Hello, I'm Dr. Sarah, a chemist with a specialization in organic chemistry. I've been working in the field for over 15 years and have extensive experience analyzing and understanding the properties of various compounds, including rubbing alcohol, which is commonly known as isopropyl alcohol.

The freezing point of a substance is the temperature at which it transitions from a liquid to a solid state. It's important to remember that the freezing point of a substance can be influenced by several factors, including the presence of impurities.

Rubbing alcohol is primarily composed of isopropyl alcohol, and it has a freezing point of -89°C (-128°F). This is significantly lower than the freezing point of water, which is 0°C (32°F). This difference in freezing points is due to the different molecular structures and intermolecular forces between water and isopropyl alcohol.

Water molecules form strong hydrogen bonds with each other, leading to a higher freezing point. On the other hand, isopropyl alcohol molecules have weaker intermolecular forces, mainly van der Waals forces. These weaker forces result in a lower freezing point for isopropyl alcohol.

It's important to note that the freezing point of rubbing alcohol can vary slightly depending on the concentration of isopropyl alcohol in the mixture. For example, a solution containing a higher concentration of isopropyl alcohol might have a slightly lower freezing point.

However, the presence of impurities, such as water or other additives, can also affect the freezing point of rubbing alcohol. For instance, if rubbing alcohol contains a significant amount of water, its freezing point will be higher than the pure isopropyl alcohol freezing point.

Therefore, while the freezing point of rubbing alcohol is generally considered to be -89°C (-128°F), it's important to consider the specific composition of the mixture to accurately determine its freezing point.

In conclusion, the freezing point of rubbing alcohol, primarily composed of isopropyl alcohol, is -89°C (-128°F). However, factors like the presence of impurities can affect this temperature, making it crucial to consider the specific composition of the rubbing alcohol solution.

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Isopropyl alcohol forms an azeotrope with water, which gives a boiling point of 80.37 --C (176.67 --F) and a composition of 87.7 wt% (91 vol%) isopropyl alcohol. Water-isopropyl alcohol mixtures have depressed melting points. It has a slightly bitter taste, and is not safe to drink.read more >>