User:Melissa Novy/Notebook/CHEM-572/2013/01/29

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==Entry title==
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==Objectives==
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* Insert content here...
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* Calculate mass of AgNO<sub>3</sub> necessary to achieve 95% CEC with Laponite (LMT).
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* Begin ion exchange reaction with AgNO<sub>3</sub> and LMT.
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==Calculations==
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  '''MW AgNO<sub>3</sub>: 169.87 g/mol'''
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  '''MW Ag<sup>+</sup>: 107.86 g/mol'''
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  '''CEC Laponite: 55 meqv/100 g'''
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  '''0.3 g LMT × (55 meqv/100 g LMT) × (1 mol Ag<sup>+</sup>/1000 meqv) × (107.86 g Ag<sup>+</sup>/1 mol Ag<sup>+</sup>) × (1 mol AgNO<sub>3</sub>/1 mol Ag<sup>+</sup>) × (169.87 g AgNO<sub>3</sub>/1 mol AgNO<sub>3</sub>) × 95% = 2.87200 g AgNO<sub>3</sub>'''
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==Laponite-Ag<sup>+</sup> Ion Exchange==
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* Protocol
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*# Place 0.3 g Laponite and 2.87200 g AgNO<sub>3</sub> in a clean, dry 50-mL Erlenmeyer flask with a stir bar.
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*# Pour in 10 mL of (50:50) H<sub>2</sub>O:EtOH, i.e. 5 mL of H<sub>2</sub>O and 5 mL of EtOH.
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*# Cover and cap the flask with aluminum foil.
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*# Stir at room temperature for 24 h.
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* Theoretical mass Laponite: 0.3 g
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** Actual mass Laponite: 0.30038 g
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* Theoretical mass AgNO<sub>3</sub>: 2.87200 g
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** Actual mass AgNO<sub>3</sub>: 2.87897 g
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* Observations: The solution became opaque and white in color after all components were added.

Revision as of 18:02, 29 January 2013

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Objectives

  • Calculate mass of AgNO3 necessary to achieve 95% CEC with Laponite (LMT).
  • Begin ion exchange reaction with AgNO3 and LMT.

Calculations

  MW AgNO3: 169.87 g/mol
  MW Ag+: 107.86 g/mol
  CEC Laponite: 55 meqv/100 g
  0.3 g LMT × (55 meqv/100 g LMT) × (1 mol Ag+/1000 meqv) × (107.86 g Ag+/1 mol Ag+) × (1 mol AgNO3/1 mol Ag+) × (169.87 g AgNO3/1 mol AgNO3) × 95% = 2.87200 g AgNO3

Laponite-Ag+ Ion Exchange

  • Protocol
    1. Place 0.3 g Laponite and 2.87200 g AgNO3 in a clean, dry 50-mL Erlenmeyer flask with a stir bar.
    2. Pour in 10 mL of (50:50) H2O:EtOH, i.e. 5 mL of H2O and 5 mL of EtOH.
    3. Cover and cap the flask with aluminum foil.
    4. Stir at room temperature for 24 h.
  • Theoretical mass Laponite: 0.3 g
    • Actual mass Laponite: 0.30038 g
  • Theoretical mass AgNO3: 2.87200 g
    • Actual mass AgNO3: 2.87897 g
  • Observations: The solution became opaque and white in color after all components were added.



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