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Unformatted text preview: a) Titration: Reaction performed COH O O C O H 3 C + NaOH CO O O C O H 3 C Na + H 2 O (ASA) Std. Base • Indicator • Balance # (make sure and use the analytical) • Buret # • All weights!! • Measuring devices (e.g. 25 ml cylinder) • Good titration data (s.f. on buret) • Concentration of the base e.g. Tablet #1 = Fred Meyer Aspirin (5 gr = 325 mg) Analytical Balance # = 3 (and manufacturer) wt of paper = 0.3743 g wt of paper and tablet = 0.8493 g Molarity of base = 0.1046 M EtOH used = 25 ml (graduated cylinder) H 2 O added = 25 ml ( “ “ ) Phenolphthalein added = 3 drops Buret # = 1 (base) Volume reading (initial) 13.02 ml (final) 30.70 ml b) TLC may detect 10 –9 g • Standards used • Unknown # • Home sample or sample from last week’s experiment • Solvent to dissolve tablet • TLC solvent (may be toxic!!!) • Sketch of plate after developing • R f values • Table of result...
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This note was uploaded on 03/14/2010 for the course CHEM chem271 taught by Professor Clark during the Spring '10 term at Shoreline.
- Spring '10