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

(Difference between revisions)
 Revision as of 17:50, 29 January 2013 (view source) (Autocreate 2013/01/29 Entry for User:Melissa_Novy/Notebook/CHEM-572)← Previous diff Current revision (14:25, 5 February 2013) (view source) (One intermediate revision not shown.) Line 15: Line 15: - ==Entry title== + ==Objectives== - * Insert content here... + * 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 + *# Place 0.3 g Laponite and 0.0001 g AgNO3 in a clean, dry 50-mL Erlenmeyer flask with a stir bar. + *# Pour in 10 mL of (50:50) H2O:EtOH, i.e. 5 mL of H2O and 5 mL of EtOH. + *# Cover and cap the flask with aluminum foil. + *# 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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## 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.