Lab#3 questions - Allan Wetzel October 15, 2007 Lab #3...

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Allan Wetzel October 15, 2007 Lab #3 Questions 1) Glucose is soluble in water due to its many OH groups, making it polar-protic, just like water. Protic referring to the hydrogen attached to the electronegative atom oxygen, and polar referring to bond dipole of the O-H bond. Glucose is also non-volatile, meaning it is stable in terms of phase-change. Glucose’s melting point is almost 50°C higher than water’s boiling point. According to Raoult’s Law, water with a soluble, non-volatile impurity will have a higher boiling point because of impure solution’s reduced vapor pressure. Therefore, the temperature must be increased past the boiling point of the pure compound to reach the P atm . The reduced vapor pressure will result in a lower freezing point as well. 2) Yes, all the of the bottle contents are identifiable by performing the same tests that we did in lab, and using the process of elimination. By evaluating the physical properties of dipole moment, water solubility, and density relative to water, we are able to distinguish
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This note was uploaded on 09/12/2008 for the course CHEM 3AL taught by Professor Li during the Fall '08 term at University of California, Berkeley.

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Lab#3 questions - Allan Wetzel October 15, 2007 Lab #3...

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