Final answer:
The question deals with the chemistry concept of freezing point depression. To calculate the freezing point after adding salt to water, a specific formula is used. However, the question doesn't provide enough information to give a numerical answer.
Step-by-step explanation:
The student's question is about the freezing point depression of a solution. Specifically, they are asking about the freezing point of a solution when salt (NaCl) is added to water and ice. The principle at play here is that adding a solute like salt to a solvent like water will lower the freezing point of that solution. This phenomenon, known as freezing point depression, is utilized in homemade ice cream making to achieve a temperature that is cold enough to solidify the mixture without turning it into a solid block of ice, thus ensuring a creamy texture.
To calculate the freezing point of the solution in question, you would use the formula for freezing point depression, ΔTf = i * Kf * m, where ΔTf is the change in freezing point, i is the van 't Hoff factor (which is 2 for NaCl, as it dissociates into two ions: Na+ and Cl-), Kf is the freezing point depression constant for water, and m is the molality of the solution. However, the specific numerical answer isn't provided in the student's question, as it would require additional information such as the freezing point depression constant for water, Kf, and the molality of the NaCl solution.