Unformatted text preview: WMMMllJliMMMMLMMﬂﬂMiMHHHLHlliLLLL‘lLllllLlJlllLLlllllH IIIIHIH‘HIIHIIH HIHHHHIIHHIH HI Aspirin Purity by pH Titration Note 00 Gra : 25
[Data Sheet] LL Name Date Partner's Name Course/Section Conc. of NaOH solution (M) Mass of vial + sample (g) Mass of vial — sample (g) i Mass of sample (g) Mass of sample (mg) Final buret reading (mL) initial buret reading (mL)
Volume of NaOl—l used (mL) mmol of NaOl-l used (mmol) mmol acid (mmol) Molar mass (M) (mg/mmol) Effective molar mass (EMM)
(mg/mmol) From the Run 3 data, calculate the range of weights of your synthesized aspirin that “all require 25 i 3 mL of the NaOH solution _____ mg
Part 2 Please attach your titration cam/6(5) to this data sheet. \Veight of your sample _____ mg Calculated volume of NaOH ___— mL What is the EMM determined from your pH titration?
Mole % salicylic acid —__ %
Mole % acetylsalicylic acid * % \Vhat is the percent difference between your EMM in Part 1 and in Part 2? ...
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- Spring '11