Concept explainers
Ethylene glycol [CH2(OH)CH2(OH)] is a common automobile antifreeze. It is water soluble and fairly nonvolatile (b.p. 197°C). Calculate (a) the freezing point and (b) the boiling point of a solution containing 685 g of ethylene glycol in 2075 g of water.
(a)
Interpretation:
Freezing point and boiling point of the solution containing 685g of ethylene glycol has to determine.
Concept introduction:
Freezing point is the temperature at which liquid turns into solid.
Freezing point depression
Where,
m- Molality of the solution
Boiling point is the temperature at which liquid turns into a gas. Example: boiling point of water is
Where,
Boiling point elevation
Where,
m- Molality of the solution
Answer to Problem 13.6WE
Freezing point of the solution =
Explanation of Solution
Given
Amount of Ethylene glycol in water =
Amount of water in which Ethylene glycol dissolved=
Boiling point of Ethylene glycol =
Conversion of grams of ethylene glycol to moles
By plugging in the value of mass and molar mass of ethylene glycol, the number of moles of ethylene glycol has calculated.
Calculation of molality of the solution
By plugging in the value of moles of ethylene glycol and amount of water, the molality of the solution has calculated.
Calculation of molality of glucose solution
By plugging in the value of moles of the glucose and kilogram of water, the molality solution has calculated.
Calculation of freezing point of the solution
The freezing point of the solution is (0-
By plugging in the value of freezing point and molal freezing point depression constant for ethylene glycol, freezing point of the solution has calculated.
Freezing point of the solution has calculated as
(b)
Interpretation:
Freezing point and boiling point of the solution containing 685g of ethylene glycol has to determine.
Concept introduction:
Freezing point is the temperature at which liquid turns into solid.
Freezing point depression
Where,
m- Molality of the solution
Boiling point is the temperature at which liquid turns into a gas. Example: boiling point of water is
Where,
Boiling point elevation
Where,
m- Molality of the solution
Answer to Problem 13.6WE
Boiling point of the solution =
Explanation of Solution
Given
Amount of Ethylene glycol in water =
Amount of water in which Ethylene glycol dissolved=
Boiling point of Ethylene glycol =
Conversion of grams of ethylene glycol to moles
By plugging in the value of mass and molar mass of ethylene glycol, the number of moles of ethylene glycol has calculated.
Calculation of molality of the solution
By plugging in the value of moles of ethylene glycol and amount of water, the molality of the solution has calculated.
Calculation of molality of glucose solution
By plugging in the value of moles of the glucose and kilogram of water, the molality solution has calculated.
Calculation of boiling point of the solution
The boiling point of the solution is (100+
By plugging in the value of freezing point and molal freezing point depression constant for ethylene glycol, freezing point of the solution has calculated.
Boiling point of the solution has calculated as
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Chapter 13 Solutions
Chemistry Atoms First - Custom Edition College Of Charleston
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