Question

What is the depression in the freezing point?

• A. \( \Delta T_f = K_f \times m \)
• B. \( \Delta T_f = K_b \times m \)
• C. \( \Delta T_f = m \times 100 \)
• D. \( \Delta T_f = K_f \times \frac{1}{m} \)

Hint:

The depression in freezing point is a colligative property, meaning it depends on the number of solute particles in the solution, not their identity.

Answer 1

The Correct Option is A

The freezing point depression (\( \Delta T_f \)) is calculated using the formula: \[ \Delta T_f = K_f \times m \] In this equation: - \( K_f \) represents the cryoscopic constant (or freezing point depression constant) of the solvent. - \( m \) denotes the molality of the solution, defined as moles of solute per kilogram of solvent. The formula illustrates a direct proportionality between the freezing point depression and the solution's molality.