Boiling Point Elevation/Freezing Point DepressionT = m Kwhere, for freezing point depression:T = T(pure solvent) - T(solution)and for boiling point elevation: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.SolventFormulaKb(°C / m)Kf(°C / m) WaterH2O0.5121.86EthanolCH3CH2OH1.221.99ChloroformCHCl33.67 BenzeneC6H62.535.12Diethyl etherCH3CH2OCH2CH32.02 The boiling point of water is 100.0°C at 1 atmosphere.How many grams of potassium chloride (74.55 g/mol), must be dissolved in 275.0 grams of water to raise the boiling point by 0.450°C? Refer to the table for the necessary boiling or freezing point constant.SolventFormulaK, (°C/m) Kf (°C/m)WaterH200.5121.86EthanolCH3CH2OH1.221.99ChloroformCHCI33.67BenzeneC6H62.535.12Diethyl ether CH3CH2OCH2CH32.02g potassium chloride.

Elevation in boiling point depend on molality.x Formula: ∆Tb=Kb×m×i Given: The molecular weight of…

Answered: The boiling point of water is 100.0°C…

Chemistry

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ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

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Boiling Point Elevation/Freezing Point Depression

T = m K

where, for freezing point depression:

T = T(pure solvent) - T(solution)

and for boiling point elevation:

T = T(solution) - T(pure solvent)

m	= (# moles solute / Kg solvent)
K_b	= boiling point elevation constant.
K_f	= freezing point depression constant.

K_b and K_f depend only on the SOLVENT. Below are some common values. Use these values for the calculations that follow.

Solvent	Formula	K_b(°C / m)	K_f(°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

The boiling point of water is 100.0°C at 1 atmosphere.
How many grams of potassium chloride (74.55 g/mol), must be dissolved in 275.0 grams of water to raise the boiling point by 0.450°C? Refer to the table for the necessary boiling or freezing point constant.
Solvent
Formula
K, (°C/m) Kf (°C/m)
Water
H20
0.512
1.86
Ethanol
CH3CH2OH
1.22
1.99
Chloroform
CHCI3
3.67
Benzene
C6H6
2.53
5.12
Diethyl ether CH3CH2OCH2CH3
2.02
g potassium chloride.

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