Boiling Point Elevation/Freezing Point Depression T = m K Where: T = T(solution) - T(pure solvent) * m = (# moles solute / Kg solvent) Kb = boiling point elevation constant. Kf = freezing point depression constant. Kb and Kf depend only on the SOLVENT. Below are some common values. Use these values for the calculations that follow.
Solvent Formula Kb(c/m) Kr(c/m)
water H2O 0.512 -1.86
Ethanol CH3CH2OH 1.22 -1.99
Chloroform CHCl3
Benzene C6H6 2.53 -5.12
Diethyl ether CH3CH2OCH2CH3
*Please note that ÎT as defined above will be a negative number for freezing point depression. Therefore, Kf must also be given as a negative number
Boiling Point Elevation/Freezing Point Depression T = m K Where: T = T(solution) - T(pure solvent) * m = (# moles solute / Kg solvent) Kb = boiling point elevation constant. Kf = freezing point depression constant. Kb and Kf depend only on the SOLVENT. Below are some common values. Use these values for the calculations that follow.
Solvent Formula Kb(c/m) Kr(c/m)
water H2O 0.512 -1.86
Ethanol CH3CH2OH 1.22 -1.99
Chloroform CHCl3
Benzene C6H6 2.53 -5.12
Diethyl ether CH3CH2OCH2CH3
*Please note that ÎT as defined above will be a negative number for freezing point depression. Therefore, Kf must also be given as a negative number
Related textbook solutions
Basic Chemistry
Principles of Chemistry Molecular Approach
Principles of Chemistry Molecular Approach
Chemistry: Structure and Properties
Chemistry: A Molecular Approach
Chemistry: A Molecular Approach
Principles of Chemistry: A Molecular Approach
Chemistry: The Central Science
Related questions
The freezing point of water is 0.00°C at 1 atmosphere.
How many grams of cobalt(II) chloride (129.8 g/mol), must be dissolved in 228.0 grams of water to reduce the freezing point by 0.450°C ? Refer to the table below for the necessary boiling or freezing point constant.
| Solvent | Formula | Kb (°C/m) | Kf (°C/m) |
|---|---|---|---|
| Water | H2O | 0.512 | 1.86 |
| Ethanol | CH3CH2OH | 1.22 | 1.99 |
| Chloroform | CHCl3 | 3.67 | |
| Benzene | C6H6 | 2.53 | 5.12 |
| Diethyl ether | CH3CH2OCH2CH3 | 2.02 |
