weight of three tablets 0.972 (1 tablet is 200mg so 200 x3 =600) weight crude ibuprofen 0.823 weight of pure ibuprophen 0.216 melting point pure ibuprofen 60-70 C observed rotation of ibuprophen standard (a) 3.5 observed rotation of ibuprophen sample (a)=0 concentration of ibuprophen standard and sample 1.000 g/ml A. What percentage of each tablet is ibuprophen? B. Based on your initial recovery of ibuprofen from the commercial tablets, what percent of the available ibuprophen did you recover in the crude sample? What was your percent recovery of ibuprophen following recrystallization? C. Does your melting point data indicate a racemic mixture or a eutomer? Explain briefly. Do your calculations for the specific rotation support the conclusion you reached from melting point data? Explain Briefly.

weight of three tablets 0.972 (1 tablet is 200mg so 200 x3 =600) weight crude ibuprofen 0.823 weight of pure ibuprophen 0.216 melting point pure ibuprofen 60-70 C observed rotation of ibuprophen standard (a) 3.5 observed rotation of ibuprophen sample (a)=0 concentration of ibuprophen standard and sample 1.000 g/ml A. What percentage of each tablet is ibuprophen? B. Based on your initial recovery of ibuprofen from the commercial tablets, what percent of the available ibuprophen did you recover in the crude sample? What was your percent recovery of ibuprophen following recrystallization? C. Does your melting point data indicate a racemic mixture or a eutomer? Explain briefly. Do your calculations for the specific rotation support the conclusion you reached from melting point data? Explain Briefly.

Appl Of Ms Excel In Analytical Chemistry

2nd Edition

ISBN:9781285686691

Author:Crouch

Publisher:Crouch

Chapter14: Chromatography

Section: Chapter Questions

Problem 9P

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A 50.0 mL juice extract is colorimetrically assayed using Nelson’s test. One milliliter (1.00 mL) of the solution and the standard glucose solution (concentration: 1mg/mL) were treated with freshly prepared Nelson’s reagent and arsenomolybdate reagent and then diluted to 10.0 mL separately in properly labeled test tubes. Absorbance at 480 nm for the standard is 1.702 and for the sample, 0.926. A. What is the principle behind the assay? B. Calculate the concentration of the reducing sugar in the 50.0 mL sample in mg/mL. Apply Beer-Lambert’s law: A=bc
A 50.0 mL juice extract is colorimetrically assayed using Nelson’s test. One milliliter (1.00 mL) of the solution and the standard glucose solution (concentration: 1mg/mL) were treated with freshly prepared Nelson’s reagent and arsenomolybdate reagent and then diluted to 10.0 mL separately in properly labeled test tubes. Absorbance at 480 nm for the standard is 1.702 and for the sample, 0.926. A. What is the principle behind the assay?
A 50.0 mL juice extract is colorimetrically assayed using Nelson’s test. One milliliter (1.00 mL) of the solution and the standard glucose solution (concentration: 1mg/mL) were treated with freshly prepared Nelson’s reagent and arsenomolybdate reagent and then diluted to 10.0 mL separately in properly labeled test tubes. Absorbance at 480 nm for the standard is 1.702 and for the sample, 0.926. A. What is the principle behind the assay? B. Calculate the concentration of the reducing sugar in the 50.0 mL sample in mg/mL. Apply Beer-Lambert’s law.