Interpretation: The freezing point of the glucose solution is to be calculated when
Concept introduction: Depression in freezing point is a term associated with the decrease in the value of the freezing point of solvents by the addition of solute molecules.
The formula used for calculating the depression in the freezing point is,
Here,
The expression for moles is as follows:
The expression for molality is as follows:
Answer to Problem 84A
The freezing point of the glucose solution when it contains
Explanation of Solution
The mass of solvent water is
Convert
By calculating the molality of glucose, the depression in the freezing point can be calculated.
It can be calculated by knowing the number of moles of glucose.
The given mass of glucose is
Substitute,
Substitute,
The molal freezing point depression constant of glucose is
So,
Substitute
Now, the freezing point of water is 0°C.
The freezing point of glucose can be calculated by subtracting the depression in the freezing point of the solution from the freezing point of water.
The freezing point of glucose is,
The freezing point of glucose is
Chapter 16 Solutions
Chemistry 2012 Student Edition (hard Cover) Grade 11
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