Workbook for Lab 22

Workbook for Lab 22 - =.359 g Percent Aspirin in sampe Melting Point Range Trial 2 148 degrees C.568 g 153 degrees C.00278 mol 7.1 mL.00278 mol

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Determination of Percent Purity of Aspirin Sample Standardization of NaOH Data Data Trial 1 .504 g Mass of KHP .553 g 6.0 mL Moles of KHP .00271 mol .390 mol/L 7.0 mL .390 mol/L * 6.0 mL = 2.34 mmol .00271 mol 15 mL 15 mL * .390 mol/L = 5.85 mmol .390 mol/L 72.6 mL Moles of HCl 38.6 mL * .1 mol/L = 3.86 mmol 3.86 mmol .359 g / .504 g * 100 = 71.2% Mass of aspirin  sample Total volume of  NaOH titrated Molarity of  standardized  NaOH Volume of  NaOH used  in titration Moles of NaOH  titrated Moles of  NaOH Volume of  NaOH for  hydrolysis Molarity of  NaOH 2.71 mmol /  7.0 mL = . 387 mol/L Moles of NaOH  for hydrolysis Average  Standardized  Molarity Total volume of  HCl titrated Moles of  excess NaOH Moles of  Aspirin 5.85 mmol NaOH - 3.86 mmol NaOH =        1.99  mmol NaOH = 1.99 mmol aspirin Mass of Aspirin  in sample 1.99 mmol *180.16 g/mol * 1 mol/1000 mmol 
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Unformatted text preview: = .359 g Percent Aspirin in sampe Melting Point Range Trial 2 148 degrees C .568 g 153 degrees C .00278 mol 7.1 mL .00278 mol Temperature at which melting first observed Temperature at which sample completely melted 2.78 mmol / 7.1 mL = . 392 mol/L Percent Yield 2.999 g 2.999 g / (138.12 g /mol) = 21.71 mmol 21.71 mmol 21.71 mmol * 180.16 g/mol = 3.911 g 1.022 g 1.022 g / 3.911 g * 100 = 26.1 % Mass of salylic acid Moles of salylic acid Moles of aspirin if 100% yield Mass of aspirin if 100% yield Mass of aspirin experimenta ll obtained Percent Yield Purity Test Using FeCl3 Magenta Magenta Color of Salicylic acid solution after FeCl3 added Color of crude product solution after FeCl3 added...
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This note was uploaded on 04/09/2008 for the course CHEM 1CL taught by Professor Van koppen during the Fall '06 term at UCSB.

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Workbook for Lab 22 - =.359 g Percent Aspirin in sampe Melting Point Range Trial 2 148 degrees C.568 g 153 degrees C.00278 mol 7.1 mL.00278 mol

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