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Some crushed ice was placed in a 400 mL beaker. Some of the ice was allowed to melt before the temperature was taken and recorded to be 0°C as temperature of the ice. A 20 % urea solution is accurately prepared from dissolving 2 grams urea in 8 grams of distilled water. This urea solution is placed in a test tube then submerged in the beaker with crushed ice. The temperature of the urea solution was taken three times(3X) at intervals of 30 seconds and was recorded to be -2°C, -4°C and -8°C respectively. The temperature was taken until the freezing point was reached indicated when 3 consecutive temperature readings were identical to be -8°C. This was recorded to be the freezing _point of the solution.

Some crushed ice was placed in a 400 mL beaker. Some of the ice was allowed to melt before the temperature was taken and recorded to be 0°C as temperature of the ice. A 20 % urea solution is accurately prepared from dissolving 2 grams urea in 8 grams of distilled water. This urea solution is placed in a test tube then submerged in the beaker with crushed ice. The temperature of the urea solution was taken three times(3X) at intervals of 30 seconds and was recorded to be -2°C, -4°C and -8°C respectively. The temperature was taken until the freezing point was reached indicated when 3 consecutive temperature readings were identical to be -8°C. This was recorded to be the freezing _point of the solution.

Chemistry & Chemical Reactivity
Chemistry & Chemical Reactivity
9th Edition
ISBN:9781133949640
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Chapter13: Solutions And Their Behavior
Section: Chapter Questions
Problem 104SCQ: Sodium chloride (NaCl) is commonly used to melt ice on roads during the winter. Calcium chloride...
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I. FREEZING POINT LOWERING: Some crushed ice was placed in a 400 mL beaker. Some of the ice was allowed to melt before the temperature was taken and recorded to be 0°C as temperature of the ice. A 20 % urea solution is accurately prepared from dissolving 2 grams urea in 8 grams of distilled water. This urea solution is placed in a test tube then submerged in the beaker with crushed ice. The temperature of the urea solution was taken three times(3X) at intervals of 30 seconds and was recorded to be -2°C, -4°C and -8°C respectively. The temperature was taken until the freezing point was reached indicated when 3 consecutive temperature readings were identical to be -8°C. This was recorded to be the freezing point of the solution. DATA AND RESULTS: (Show all pertinent computations on the space provided if applicable. +Answers with no computation will not be considered.) Mass of urea in grams Mass of water in grams Freezing point of ice in degrees Celsius Freezing point of urea solution in degrees Celsius Molecular weight of urea in g/mol Change in freezing point SOLUTION/S:
Transcribed Image Text:I. FREEZING POINT LOWERING: Some crushed ice was placed in a 400 mL beaker. Some of the ice was allowed to melt before the temperature was taken and recorded to be 0°C as temperature of the ice. A 20 % urea solution is accurately prepared from dissolving 2 grams urea in 8 grams of distilled water. This urea solution is placed in a test tube then submerged in the beaker with crushed ice. The temperature of the urea solution was taken three times(3X) at intervals of 30 seconds and was recorded to be -2°C, -4°C and -8°C respectively. The temperature was taken until the freezing point was reached indicated when 3 consecutive temperature readings were identical to be -8°C. This was recorded to be the freezing point of the solution. DATA AND RESULTS: (Show all pertinent computations on the space provided if applicable. +Answers with no computation will not be considered.) Mass of urea in grams Mass of water in grams Freezing point of ice in degrees Celsius Freezing point of urea solution in degrees Celsius Molecular weight of urea in g/mol Change in freezing point SOLUTION/S:
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