You need to purify 0.8 grams of an impure sample of trans-cinnamic acid. After the purification is completed you isolate 0.57 grams of trans-cinnamic acid and record a melting point range of 129-132 °C. Cinnamic Acid has a solubility in ethanol of 13.9 g/100 ml at 10 0C and a solubility in water of 0.055 g/100 ml at 25 °C. (a) Explain why the recrystallization of trans-cinnamic acid must use a mixed solvent system. Please explain why the sample couldn't be successful recrystallized in ethanol alone. Calculations should be used to support your answer. (b) Calculate the % recovery and the % error for the melting point.

You need to purify 0.8 grams of an impure sample of trans-cinnamic acid. After the purification is completed you isolate 0.57 grams of trans-cinnamic acid and record a melting point range of 129-132 °C. Cinnamic Acid has a solubility in ethanol of 13.9 g/100 ml at 10 0C and a solubility in water of 0.055 g/100 ml at 25 °C. (a) Explain why the recrystallization of trans-cinnamic acid must use a mixed solvent system. Please explain why the sample couldn't be successful recrystallized in ethanol alone. Calculations should be used to support your answer. (b) Calculate the % recovery and the % error for the melting point.

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

See similar textbooks

Similar questions

Chp15-4(3)
Only c
What is the driving force to crystallization? temperature gradient nucleation supersaturation concentration gradient saturation
2, vi, viii, ix only those
1. Which IMF or IMFs are correlated with molar mass? Describe this correlation 2. Heptane, hexane, and pentane are hydrocarbons. Rationalize the evaporation data of these substances based the type(s) of IMFs present in each and the relative strengths of these. 3. Ethanol, methanol, 1-propanol, and 2-propanol are alcohols. Rationalize the evaporation data of these substances based the type(s) of IMFs present in each and the relative strengths of these. (Hint: How are these molecules alike and how are they different?) 4. 1-propanol and 2-propanol are isomers, substances having the same chemical formula. Is the evaporation data for these substances the same or different? If different, can you account for why this may be the case from a comparison of the Lewis structures of each substance and the IMFs present in each substance? Explain. 5. Acetone and 2-propanol are chemically interconvertible. Reduction (by the addition of the equivalent of H2) of acetone yields 2-propanol. Conversely,…
Please don't provide handwriting solution
3-pentene-2-one =1.(ch3ch2ch2)2culi 2.h30+= 4-methylpentane nitrile 1.LiAlH4 2.H2O= 2,2-dimethylpropane nitrile 1. ch3-c(ch3)-mgcl 2. h3O+=
10. Choose the CORRECT statement of the chromophores: Saturated organic functional groups that absorb in the UV-VIS region. Contains electrons with relatively high excitation energies. The chromophore can display colour when it is exposed to visible light. More chromophores in the same molecule cause a hypsochromic effect
2
Name the family to which each organic compound belongs. The first answer has been filled in for you. compound CH₂ || CH₂-C-0-C- CH₂ O || CH₂ || CH–C—NH, CH, OH I | CH₂-CH-C || || CH,—C–NH CH, X family ester 0
13.5 grams of p-cresol (M: 108 g / mol) and 12.8 grams of methyl tert-butyl ether (M: 98 g / mol) were reacted in the presence of zeolite catalyst (2% by mass). Since 10.5 grams of 2-tert-butyl-p-cresol (M: 164 g / mol) was obtained from the reaction;a) Calculate the% yield of the reaction.b) Calculate the atomic economy of the reaction.
Can someone help me find the IUPAC for (CH3CH2)3CCH2CH3? I think the longest carbon chain is 9 (nonane) but I'm probably wrong.