Formula Used:
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Definition: The ebullioscopic constant (kb) relates molality to boiling point elevation when a solute is added to a solvent.
Purpose: It helps determine how much the boiling point of a solvent will increase when a non-volatile solute is dissolved in it.
The calculator uses the formula:
Where:
Explanation: The boiling point elevation is divided by the product of Van't Hoff factor and molality to determine the solvent's ebullioscopic constant.
Details: This constant is crucial for understanding colligative properties and is specific to each solvent. It helps predict boiling point changes in solutions.
Tips: Enter the boiling point elevation (ΔTb) in Kelvin, Van't Hoff factor (default 1.0 for non-electrolytes), and molality in mol/kg. All values must be > 0.
Q1: What is the Van't Hoff factor?
A: It accounts for the number of particles a solute dissociates into (e.g., 1 for sugar, ~2 for NaCl, 3 for CaCl2).
Q2: What are typical values for kb?
A: Common values are 0.512 K·kg/mol for water, 2.53 for benzene, and 3.63 for acetic acid.
Q3: How is boiling point elevation measured?
A: It's the difference between the solution's boiling point and the pure solvent's boiling point.
Q4: Does this work for all solvents?
A: Yes, but each solvent has its own characteristic kb value.
Q5: What's the difference between kb and kf?
A: kb is for boiling point elevation, while kf (cryoscopic constant) is for freezing point depression.