Final answer:
To measure the freezing point using a LabQuest Vernier, place water in a test tube, measure its initial temperature, and monitor the temperature change until freezing. This method helps determine the molar mass of a solute in a solution by observing the freezing point depression, which is best for dilute solutions. Therefore, the correct answer is A) Chemistry Lab Techniques.
Step-by-step explanation:
To measure the freezing point using the LabQuest Vernier, you would follow a methodical procedure that begins with placing a specific amount of water into a test tube, as per Chemistry Lab Techniques.
The initial temperature is measured and recorded. Then, by cooling the solution and carefully monitoring the temperature over time, you can determine the freezing temperature when the water changes from liquid to solid.
This process is not just for pure water but can also be applied to solutions, wherein the mass of the solute is known and the behavior of the solution is assumed to be ideal. The colligative properties of the solution, such as freezing point depression, allow you to calculate the molar mass of an unknown compound.
It is important to note that this method is typically accurate for dilute solutions (less than or equal to 1% by mass). For more accurate results, a graph of time versus temperature can be plotted, especially when transitioning from solid to liquid, or vice versa.