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

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Current revision (14:25, 5 February 2013) (view source)
 
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   '''MW Ag<sup>+</sup>: 107.86 g/mol'''
   '''MW Ag<sup>+</sup>: 107.86 g/mol'''
   '''CEC Laponite: 55 meqv/100 g'''
   '''CEC Laponite: 55 meqv/100 g'''
-
   '''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>'''
+
   '''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 Ag<sup>+</sup>/1 mol AgNO<sub>3</sub>) × (1 mol AgNO<sub>3</sub>/169.87 g AgNO<sub>3</sub>) × 95% = 0.00009953 g AgNO<sub>3</sub>'''
==Laponite-Ag<sup>+</sup> Ion Exchange==
==Laponite-Ag<sup>+</sup> Ion Exchange==
* Protocol
* Protocol
-
*# 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.
+
*# Place 0.3 g Laponite and 0.0001 g AgNO<sub>3</sub> in a clean, dry 50-mL Erlenmeyer flask with a stir bar.
*# 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.
*# 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.
*# Cover and cap the flask with aluminum foil.
*# Cover and cap the flask with aluminum foil.
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** Actual mass Laponite: 0.30038 g
** Actual mass Laponite: 0.30038 g
-
* Theoretical mass AgNO<sub>3</sub>: 2.87200 g
+
* Theoretical mass AgNO<sub>3</sub>: 0.00010 g
-
** Actual mass AgNO<sub>3</sub>: 2.87897 g
+
** Actual mass AgNO<sub>3</sub>: 0.00101 g
* Observations: The solution became opaque and white in color after all components were added.
* Observations: The solution became opaque and white in color after all components were added.

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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 Ag+/1 mol AgNO3) × (1 mol AgNO3/169.87 g AgNO3) × 95% = 0.00009953 g AgNO3

Laponite-Ag+ Ion Exchange

  • Protocol
    1. Place 0.3 g Laponite and 0.0001 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: 0.00010 g
    • Actual mass AgNO3: 0.00101 g
  • Observations: The solution became opaque and white in color after all components were added.



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