Liquid Solution

Ehylene glycol (HOCH2CH2OH) is a low volatility liquid commonly sold as antifreeze to be mixed with water in car radiators. By adding a nonvolatile solute to the water in the radiator, not only is the freezing point of the resulting solution substantially lower than the freezing point of water, the boiling point is raised substantially. Thus a water/ethylene glycol mixture protects the radiator both from freezing and from boiling over. Calculate the freezing and boiling points of a mixture of water and ethylene glycol obtained by mixing 2.00 kg ethylene glycol (M.W. = 62.0682 g/mol) and 2.00 kg of water.

4 Answers

106
Asish Mahapatra ·

could you mention Kf and Kb for water? (as its concentration is most so it is the solvent)

Aside from that it is simple.
m=molality = (2000/62)/2
ΔTf = Kfm

so, freezing point = -Kfm

similarly bp = 100°C + Kbm

1
mentor_Layak Singh ·

Kf =1.858 ° C/m
kb= .512 ° C/m
Now calculate .

106
Asish Mahapatra ·

freezing point = -1.858*16.129
= -29.7°C

bp = 100+0.512*16.129
= 108.26°C

1
mentor_Layak Singh ·

Yes correct answers !!!!!!!
keep it up !

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