Molal Freezing Point Depression and Boiling Point Elevation Constants
Solvent Kf Kb
acetic acid 3.90 oC/molal 3.07 oC/molal
acetone   1.71
benzene 4.90 2.53
carbon tetrachloride   5.03
chloroform   3.63
ethyl alcohol   1.22
formic acid 2.77  
methyl alcohol   0.83
napthalene 6.8  
phenol 7.40 3.56
toluene   3.33
water 1.86 0.52