Sign In | Subscribe
Start learning today, and be successful in your academic & professional career. Start Today!
Loading video...
This is a quick preview of the lesson. For full access, please Log In or Sign up.
For more information, please see full course syllabus of Organic Chemistry
  • Discussion

  • Download Lecture Slides

  • Table of Contents

  • Related Books & Services

Bookmark and Share

Start Learning Now

Our free lessons will get you started (Adobe Flash® required).
Get immediate access to our entire library.

Sign up for Educator.com

Membership Overview

  • Unlimited access to our entire library of courses.
  • Search and jump to exactly what you want to learn.
  • *Ask questions and get answers from the community and our teachers!
  • Practice questions with step-by-step solutions.
  • Download lesson files for programming and software training practice.
  • Track your course viewing progress.
  • Download lecture slides for taking notes.
  • Learn at your own pace... anytime, anywhere!

Introduction to Recrystallization

Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.

  • Intro 0:00
  • Crystallization to Purify a Solid 0:10
    • Crude Solid
    • Hot Solution
    • Crystals
    • Supernatant Liquid
  • Theory of Crystallization 2:34
    • Theory of Crystallization
  • Analysis and Obtaining a Second Crop 3:40
    • Crystals → Melting Point, TLC
    • Supernatant Liquid → Crude Solid → Pure Solid
    • Crystallize Again → Pure Solid (2nd Crop)
  • Choosing a Solvent 5:19
    • 1. Product is Very Soluble at High Temperatures
    • 2. Product has Low Solubility at Low Temperatures
    • 3. Impurities are Soluble at All Temperatures
    • Check Handbooks for Suitable Solvents
  • Why Isn't This Dissolving?! 8:46
    • If Solid Remains When Solution is Hot
    • Still Not Dissolved in Hot Solvent?
  • Where Are My Crystals?! 12:23
    • If No Crystals Form When Solution is Cooled
    • Still No Crystals?
  • Tips, Tricks and Warnings 16:26
    • Always Use a Boiling Chip or Stick!
    • Use Charcoal to Remove Colored Impurities
    • Solvent Pairs May Be Used
    • Product May 'Oil Out'