Difference between revisions of "ESR Lab Activity"

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*Solution A: 0.05 M NaOH; 0.05 grams NaOH (39.997 g/mol) into 25 ml EtOH.
 
*Solution A: 0.05 M NaOH; 0.05 grams NaOH (39.997 g/mol) into 25 ml EtOH.
 
*Solution B: 1 M hydroquinone solution.
 
*Solution B: 1 M hydroquinone solution.
*Procedure: Prepare two syringed with  
+
*Procedure: Prepare two 60 ml syringes, 1 with solution A and 1 with solution B.
 +
*Degas the syringe that contains solution B
 +
*Attach to double syringe drive
 +
*Turn on double syringe drive
 +
*Collect data
  
 
==Results==
 
==Results==

Revision as of 19:58, 21 April 2016

Introduction

We are going to collect an ESR spectrum from a series of substituted hydroquinones.

Hydroquinones.png

A=Hydroquinone (110.11 g/mol)
B=methylhydroquinone (124.14 g/mol)
C=2,3-dimethylhydroquinone (138.16 g/mol)
Name Molar Mass Sigma Product Number Cost
Hydroquinone 110.11 g/mol H9003 22.90 / 100g
Methylhydroquinone 124.14 g/mol 112968 59.20 / 250g
2,3-dimethylhydroquinone 138.16 g/mol 300756 118.00 / 5g

Experimental

Beaker Method

  • Solution A: 1 M NaOH; 1 gram NaOH (39.997 g/mol) into 25 mL EtOH.
  • Solution B: 1 M hydroquinone solution.
  • Procedure: To 2 ml of 1 M hydroquinone solution add 2-3 drops of solution A. A color change will indicate the reaction has occurred. Quickly transfer colored sample to ESR sample tube, place in ESR spectrometer, tune, and collected data.

Flow Method

  • Solution A: 0.05 M NaOH; 0.05 grams NaOH (39.997 g/mol) into 25 ml EtOH.
  • Solution B: 1 M hydroquinone solution.
  • Procedure: Prepare two 60 ml syringes, 1 with solution A and 1 with solution B.
  • Degas the syringe that contains solution B
  • Attach to double syringe drive
  • Turn on double syringe drive
  • Collect data

Results

Analysis

Conclusions