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Freezing Point Depression

#### Q. An aqueous solution has a boiling point of 101.27oC. Determine the freezing point of this solution (the molal boiling point constant for water is 0.52oC kg/mole while the molal freezing point constant is 1.86oC kg/mole)

Solved • May 6, 2020

Freezing Point Depression

#### Q. Name of compound: BaCl2.2H2O (not CaCl2.2.H2O) Gram Formula Weight = 244 g/moles Grams of compound used: 10.370 g Moles of compound used: 0.0425 moles Total grams of water used = 75.000 grams Freezing point of pure water: 0oC Observed freezing pint of solution= -3.1oC Considering that the BaCl2.2H2O is a hydrate, and that 10.370 grams of the compound were used initially, how many grams of water of the total 75.000 grams of water came just from the “water of hydration” of BaCl2.2H2O?

Solved • May 1, 2020

Freezing Point Depression

#### Q. Name of compound: BaCl2.2H2O (not CaCl2.2.H2O) Gram Formula Weight = 244 g/moles Grams of compound used: 10.370 g Moles of compound used: 0.0425 moles Total grams of water used = 75.000 grams Freezing point of pure water: 0oC Observed freezing pint of solution= -3.1oC What is the ACTUAL “I value” (van’t Hoff Factor) for this compound as found from the data provided?

Solved • May 1, 2020

Freezing Point Depression

#### Q. Name of compound: BaCl2.2H2O (not CaCl2.2.H2O) Gram Formula Weight = 244 g/moles Grams of compound used: 10.370 g Moles of compound used: 0.0425 moles Total grams of water used = 75.000 grams Freezing point of pure water: 0oC Observed freezing pint of solution= -3.1oC What is the expected (theoretical) “I” value (the van’t Hoff factor) for BaCl2.2H2O?

Solved • May 1, 2020

Freezing Point Depression

#### Q. Name of compound: BaCl2.2H2O (not CaCl2.2.H2O) Gram Formula Weight = 244 g/moles Grams of compound used: 10.370 g Moles of compound used: 0.0425 moles Total grams of water used = 75.000 grams Freezing point of pure water: 0oC Observed freezing pint of solution= -3.1oC What is the Molality of th solution?

Solved • May 1, 2020

Freezing Point Depression

#### Q. 5. What is the molality of the solution? A) What is the expected (theoretical) “I” value (the van’t Hoff factor) for BaCl2.2H2O? B) Considering that the BaCl2.2H2O is a hydrate, and that 10.370 grams of the compound were used initially, how many grams of water of the total 75.000 grams of water came just from the “water of hydration” of BaCl2.2H2O? C) What is the ACTUAL “I value” (van’t Hoff Factor) for this compound as found from the data provided?

Solved • Apr 30, 2020

Freezing Point Depression

#### Q. Ethylene glycol (EG), CH2(OH)CH2(OH), is a common automobile antifreeze. It is water soluble and fairly nonvolatile (b.p. 197°C). Calculate freezing point of a solution containing 351.5 g of ethylene glycol in 3507 g water. The molar mass of ethylene glycol is 62.07 g/mol.

Solved • Apr 29, 2020