User:Karlena L. Brown/Notebook/PVOH Research/2012/11/09: Difference between revisions
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==OBJECTIVES== | ==OBJECTIVES== | ||
* Prepare PVOH films for Acetylation Reactions | * Prepare PVOH films for Acetylation Reactions | ||
* Titrate PVOH film solutions | |||
==General Formula for reactions== | |||
Polyvinyl alcohol + [HoAc]→Polyvinyl acetate | |||
==Acetylation Reaction Protocol & Film Preparation== | ==Acetylation Reaction Protocol & Film Preparation== | ||
* In 10mL beaker, weigh out ~ 1.0 grams PVOH (MW 22K) | * In 10mL beaker, weigh out ~ 1.0 grams PVOH (MW 22K) | ||
* Then, using a graduated cylinder add ~ | * Then, using a graduated cylinder add ~ 3-4 mL H<sub>2</sub>O to the beaker | ||
* After adding and combining PVOH (MW 22K) in a small beaker with H<sub>2</sub>O, add a stir bar and prepare to stir solution | * After adding and combining PVOH (MW 22K) in a small beaker with H<sub>2</sub>O, add a stir bar and prepare to stir solution | ||
* On hot plate, stir and heat beaker solutions at 70-80°C for ~ 12 min or until PVOH dissolves | * On hot plate, stir and heat beaker solutions at 70-80°C for ~ 12 min or until PVOH dissolves | ||
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| align="center" style="background:#f0f0f0;"|'''Acetic Acid (mL)''' | | align="center" style="background:#f0f0f0;"|'''Acetic Acid (mL)''' | ||
| align="center" style="background:#f0f0f0;"|'''Hydrochloric Acid (drops)''' | | align="center" style="background:#f0f0f0;"|'''Hydrochloric Acid (drops)''' | ||
| align="center" style="background:#f0f0f0;"|'''Total Volume(mL)''' | |||
| align="center" style="background:#f0f0f0;"|'''Total Volume(mL)''' | | align="center" style="background:#f0f0f0;"|'''Total Volume(mL)''' | ||
|- | |- | ||
| 1.0062||1.30||2||7 | | 1.0062||1.30||2||3.70||7 | ||
|- | |- | ||
| 1.0043||0.26||2||7 | | 1.0043||0.26||2||4.74||7 | ||
|- | |- | ||
| 1.0052||0.52||2||7 | | 1.0052||0.52||2||4.48||7 | ||
|- | |- | ||
| 1.0027||0.78||2||7 | | 1.0027||0.78||2||4.22||7 | ||
|} | |} | ||
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1.0g PVOH × (1 mol PVOH/44.00g PVOH) × (0.6 mol HoAc/1 mol PVOH) × (60.00g HoAc/1 mol HoAc) = 0.82g HoAc | 1.0g PVOH × (1 mol PVOH/44.00g PVOH) × (0.6 mol HoAc/1 mol PVOH) × (60.00g HoAc/1 mol HoAc) = 0.82g HoAc | ||
0.82g HoAc × (1mL HoAc/1.05g HoAc)= 0.78mL HoAc | 0.82g HoAc × (1mL HoAc/1.05g HoAc)= 0.78mL HoAc | ||
==Titration Procedures & Solution Preparation== | |||
'''0.2M Sodium Bicarbonate (NaHCO<sub>3</sub>)solution for titration preparation:''' | |||
* Weigh out ~16.802g NaHCO<sub>3</sub> | |||
(Actual NaHCO<sub>3</sub> Mass= 16.8046g) | |||
* Add the NaHCO<sub>3</sub> solids to a 250mL closed cap plastic bottle | |||
* Next, add ~2500mL of H<sub>2</sub>O to the bottle along with large magnetic stir bar | |||
* Place container on a stir plate and stir solution for ~10 minutes until all solids dissipate | |||
'''MW NaHCO<sub>3</sub>: 84.01 g/mol''' | |||
0.2M NaHCO<sub>3</sub> × 1L H<sub>2</sub>O × (84.01g NaHCO<sub>3</sub>/1 mol NaHCO<sub>3</sub>)= 16.802g NaHCO<sub>3</sub> | |||
==Notes== | |||
* Only the repeating unit of PVOH (22K) was focused upon when calculating % weight of HoAc additions to each solution (titration preparation) | |||
* Molecular weight of repeating polyvinyl alcohol unit [C2H3OH] = 44.06g/mol | |||
1g PVOH(1 mol PVOH unit/44.06g PVOH) x (1 mol OH/1 mol PVOH)= 0.022696 mol PVOH | |||
* In addition, the 1:1 HoAc ratio solution overheated by boiling; therefore, this solution was not used for the titration analysis. | |||
* Also the actual amount of NaHCO<sub>3</sub> used was 16.8046g; it is not necessary to prepare solution in a volumetric flask because the solution will be standardize to find the actual concentration. | |||
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Revision as of 13:58, 30 November 2012
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OBJECTIVES
General Formula for reactionsPolyvinyl alcohol + [HoAc]→Polyvinyl acetate Acetylation Reaction Protocol & Film Preparation
REPEAT PROCEDURE ABOVE FOUR TIMES TO PREPARE FOUR FILMS
Acetylation Reaction Calculations1:1 HoAc Reaction Ratio: MW R-CH2CHOH-R: 44.00 g/mol MW Acetic Acid (HoAc): 60.00 g/mol 1.0g PVOH × (1 mol PVOH/44.00g PVOH) × (1 mol HoAc/1 mol PVOH) × (60.00g HoAc/1 mol HoAc) = 1.36g HoAc 1.36g HoAc × (1mL HoAc/1.05g HoAc)= 1.30mL HoAc 20% HoAc Reaction Ratio: MW R-CH2CHOH-R: 44.00 g/mol MW Acetic Acid (HoAc): 60.00 g/mol 1.0g PVOH × (1 mol PVOH/44.00g PVOH) × (0.2 mol HoAc/1 mol PVOH) × (60.00g HoAc/1 mol HoAc) = 0.27g HoAc 0.27g HoAc × (1mL HoAc/1.05g HoAc)= 0.26mL HoAc 40% HoAc Reaction Ratio: MW R-CH2CHOH-R: 44.00 g/mol MW Acetic Acid (HoAc): 60.00 g/mol 1.0g PVOH × (1 mol PVOH/44.00g PVOH) × (0.4 mol HoAc/1 mol PVOH) × (60.00g HoAc/1 mol HoAc) = 0.55g HoAc 0.55g HoAc × (1mL HoAc/1.05g HoAc)= 0.52mL HoAc 60% HoAc Reaction Ratio: MW R-CH2CHOH-R: 44.00 g/mol MW Acetic Acid (HoAc): 60.00 g/mol 1.0g PVOH × (1 mol PVOH/44.00g PVOH) × (0.6 mol HoAc/1 mol PVOH) × (60.00g HoAc/1 mol HoAc) = 0.82g HoAc 0.82g HoAc × (1mL HoAc/1.05g HoAc)= 0.78mL HoAc Titration Procedures & Solution Preparation0.2M Sodium Bicarbonate (NaHCO3)solution for titration preparation:
(Actual NaHCO3 Mass= 16.8046g)
MW NaHCO3: 84.01 g/mol 0.2M NaHCO3 × 1L H2O × (84.01g NaHCO3/1 mol NaHCO3)= 16.802g NaHCO3 Notes
1g PVOH(1 mol PVOH unit/44.06g PVOH) x (1 mol OH/1 mol PVOH)= 0.022696 mol PVOH
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