lab report 3 (no name)

lab report 3 (no name) - CHEMISTRY 29B PRELAB WRITEUP AND...

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CHEMISTRY 29B PRELAB WRITEUP AND EXPERIMNETAL REPORT SHEET Name: T.A’S name: Date: 2/14/07 Experiment #: 3 Title: Formation of Methyl-3 nitrobenzoate via elecrophillic substitution Purpose: We will nitrate methyl benzoate via electrophillic aromatic substitution to form methyl-3 nitrobenzoate Preliminary write-up: Materials and products: Name Composition Amount Mol Mass (g/mole) Melting Point ( ° C) Boiling Point ( ° C) Methyl benzoate Ph-COOCH 3 30 g 136.16 - 199.6 Methyl-3 nitrobenzoate NO 2 -Ph-COOCH 3 - 181.15 78.0 - Sulfuric acid H 2 SO 4 0.8 mL 98.01 10.0 290.0 Nitric acid HNO 3 0.2 mL 63.01 -42.0 83.0 Methanol CH 3 OH .2 mL 32.04 -97.0 64.7 1 10x100 mm reaction tube; 1 analytical balance; 1 spatula; 1 pasteur pipette; 1 stirring rod; 1 small beaker; 1 Hirsh funnel; 1 vacuum aspirator; 1 melting point apparatus; 2 melting point capillaries C OCH 3 O Methyl Benzoate C OCH 3 O NO 2 Methyl 3-nitrobenzoate S O O O O H H Sulfuric acid Nitric acid N O O H O H 3 C OH methanol Reactions: HNO 3 + 2 H 2 SO 4 NO 2 + + 2 HSO 4 - + H 3 O + Ph-COOCH 3 + HNO 3 + H 2 SO 4 NO 2 -Ph-COOCH 3 Equations: Theoretical yield =(.2995 g M.B.)x (1 mole M.B./136.6 g)x (181.5 g M.3.N.B/ 1 mole) =.398 g Methyl-3-nitrobenzoate Percent yield = (actual yield/theoretical yield) x 100 % Crude product yield = (.289 g actual/.398 g theoretical) x 100% = 72.6% Pure product yield = (.0621 g actual/.398 g theoretical) x 100% = 15.6 % Experimental procedures: 1. Add .30 grams methyl benzoate to cooled reaction tube with .6 mL conc. sulfuric acid. Mix contents 2. Cool mixture to 0 ° C and add drop-wise a mixture of .2mL concentrated Sulfuric acid and .2mL nitric acid; continue mixing while adding mixture and keep temperature low
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This note was uploaded on 04/07/2008 for the course CHEM 29B taught by Professor Cziplack during the Spring '08 term at Brandeis.

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lab report 3 (no name) - CHEMISTRY 29B PRELAB WRITEUP AND...

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