User:Karlena L. Brown/Notebook/PVOH Research/2012/11/09: Difference between revisions
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# Begin titrating by turning the stopcock on the burette allowing the 0.2M NaHCO<sub>3</sub> solution to steadily stream out | # Begin titrating by turning the stopcock on the burette allowing the 0.2M NaHCO<sub>3</sub> solution to steadily stream out | ||
# Slow the pace of the 0.2M NaHCO<sub>3</sub> solution to drops when the PVOH solution begins to turn red in color | # Slow the pace of the 0.2M NaHCO<sub>3</sub> solution to drops when the PVOH solution begins to turn red in color | ||
# Once the solution completely to turns red, stop titrating by turning the stopcock to ''' | # Once the solution completely to turns red, stop titrating by turning the stopcock to '''OFF''' position | ||
# Record the new 0.2M NaHCO<sub>3</sub> volume within the burette | # Record the new 0.2M NaHCO<sub>3</sub> volume within the burette | ||
Revision as of 22:59, 14 December 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 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
(Actual KHP Mass= 20.424g)
MW NaHCO3: 204.24 g/mol 1M KHP × 0.1L H2O × (204.24g KHP/1 mol KHP)= 20.424g KHP Titration Procedures and Preparations
REPEAT THE ABOVE STEPS AGAIN FOR THE NEXT THREE PVOH SOLUTIONS
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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