L3 - Lecture 3 [Lecture 2 will also be given today] Chem...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Lecture 3 [Lecture 2 will also be given today] Chem 237 Week 3 Sept 6, 2010 [Lectures given August 30/31, 2010] Melting Point Range as a Measure of Purity? Pure compounds usually melt over a narrow temperature range, often 1C or less. Impure compounds melt lower than pure compounds and over a wider temperature range. Therefore, the melting point range of a solid can be used as a method to assess the purity of a compound. This [next 3 rd ] Week Part 1 Finish Extraction Lab 1 Perform TLCs on separated products Perform melting points on separated products Recrystallize aspirin Lab Report due next week [week 4] in class - hard copy submission only Page 1 This [next 3 rd ] Week Part 2 Begin Experiment 2: An Unexpected Reaction of 2,3-dimethyl-2,3- butanediol Perform reaction involves a simple distillation Work up product use extraction Purify product fractional distillation You should be able to complete this experiment in one laboratory session Your Goal What is(are) the product(s) of this reaction? X Outline of Experiment Week 1: Perform synthesis (simple distillation) Extraction Fractional distillation if there is time. IR NEW Page 2 Distillation Vapor pressure of pure A , P A Daltons Law P = P A + P B When P = P air , solution boils Separation of a mixture of liquids based on _____________________ of the components If we distill a mixture of A & B , what is the composition of the distillate? Raoults Law: P A = P A = X A = mole fraction of A in liquid different vapor pressures liquid A liquids A & B X A P A partial pressure of A Relative Volatility a What is the composition of the vapor in distillations?...
View Full Document

This note was uploaded on 11/19/2010 for the course CHEM 237 taught by Professor Wilson during the Fall '08 term at University of Illinois, Urbana Champaign.

Page1 / 10

L3 - Lecture 3 [Lecture 2 will also be given today] Chem...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online