13Post - DOWN MEMORY LANE Lengths, Weights, Volumes,...

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1 CHE 133 A brief review DOWN MEMORY LANE LABORATORY MEASUREMENT Lengths, Weights, Volumes, Density HOUSEHOLD "CHEMICALS" Household Materials - Analysis Vanillyl Alcohol - Synthesis Hydrogen Peroxide - Assay Baking Soda - Assay Food Dyes - Spectroscopy Food Dyes – Chromatography Fruit Juices – Acid Content Vinegar - Assay Alum - Synthesis THE HARDWARE Pipet & Syringe Buret Beakers, Cylinders, Flasks Bunsen Burner Hot Plate Gas Syringe Melting Point Apparatus Analytical Balance Top Loading Balance Visible/UV Spectrophotometer pH Meter Infrared Spectrometer Safety Goggles THE TECHNIQUES CHEMICAL ANALYSIS Weighing (by difference) Standardization Volumetric Techniques Gravimetric Analysis Flame Tests Spectrophotometry Gas Collection and Measurement Melting Points Qualitative Infrared Spectroscopy CHEMICAL SEPARATION Use solubility for separation Paper Chromatography Gravity and Vacuum Filtration CHEMICAL SYNTHESIS Alum Vanillyl Alcohol ANALYSIS OF EXPERIMENTAL DATA Measures of accuracy and precision Significant Figures Tabulation and Graphing of Data OH OCH 3 H C O OH OCH 3 H O C H H + BH 4 - + 4 H 2 O + H 3 BO 3 + OH - 44 vanillin sodium borohydride vanillyl alcohol Theoretical yield Percent yield Reduction /H 2 Stoichiometry Infrared absorptions Organic functional groups Pct Yield = 100 x Actual Yield/Theoretical Yield Net Effect: Addition of 2 H atoms aldehyde O-H Φ -H C-H 3 HC=O C C Vanillin IR Spectrum 1500 cm -1 – 4000 cm -1 H H H
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2 2 MnO 4 - + 6 H + + 5 H 2 O 2 2 Mn 2+ + 8 H 2 O + 5 O 2 (g) 2 MnO 4 - + 16 H + + 5 C 2 O 4 =
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13Post - DOWN MEMORY LANE Lengths, Weights, Volumes,...

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