Determine the required concentration (in percent by mass) for an aqueous ethylene glycol solution to have a boiling point of 104.0C . What is its freezing point?
For pure water to 1 atm :
Cryoscopic constant (Kc)= 1,86 ªC/m
Ebulloscopic constant (Kb)= 0,52ªC/m
Boiling Point= 100ªC
Freezing point= 0ªC
For aqueous ethylene glycol solution
Boiling Point: 104ªC
WM(Ethylen glicol): 62,07g/mol (MSDS Data)
Calculation of %w of ethylene glycol
Calculation of molalidad of solution
Calculation of weight of ethylene glicol dissolved in solution
Calculation of % mass
The requerid concentration for an aqueous ethylene glycol solution to have a boiling point of 104,0 is 47,8%.
Calculating the freezing point.
(C is ºC)
difference of temperature is 14,3ºC respect boiling point of pure water to 1 atm (0ºC), final freezing point is -14,3ºC,
The presence of ethylene glycol in the water, affects the colligative properties, such as boiling point and the freezing point.
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