how do you purify Biphenyl contaminated with Fluorene? what is the method and solvent?

7,071 results
  1. Low recovery

    The question is: A student performs a crystallization on an impure sample of biphenyl. The sample weighs 0.5g and contains about 5% impurity. Using his knowledge of solubility, he decides to use benzene as a solvent. The final weight is only 0.02g. Why is

  2. Chemistry

    A) A compound distributes between water (solvent 1) and benzene (solvent 2) with Kp = 2.7. If 1.0g of the compound were dissolved in 100mL of water, how much compound could be extracted by three 10-mL portions of benzene? B) If the value of Kp is 0.5 for

  3. Rf values

    Question: Consider a sample that is a mixture composed of biphenyl, benzoic acid and benzyl alcohol. The sample is spotted on a TLC plate and developed in a dichloromethane-cyclobutane solvent mixture. Predict the relative Rf values for the three

  4. Chemistry

    A student performs a crystallization on an impure sample of biphenyl. The sample weighs 0.5 g and contains about 5% impurity. Based on his knowledge of solubility the student decides to use benzene as the solvent. After crystallization, the crystals are

  5. Naphthalene

    Question: You are about to purify an impure sample of naphthalene by column chromatography. What solvent should you use to elute the sample? My answer: Naphthalene is very nonpolar so a very nonpolar solvent like hexane should be used.

  6. Ochem

    A student needed to determine the percent composition of a mixture that contained fluorene and benzoic acid. The student took 283 mg of the mixture and used the extraction method to separate the components. Then both compounds were recrystallized and

  7. Chemistry

    What are the boiling point of a solution prepared by dissolving 2.40g of biphenyl(C^12H^10) in 75.0g of benzene? The molecular weight of biphenyl is 154..

  8. To Sheryl: polarity

    The exact question is: Benzyl alcohol (bp 205 degree C) was selected by a student to crystallize fluorenol (mp 153-154 degrees C) because the solubility characteristics of this solvent are appropriate. However, this solvent is not a good choice. Explain.

  9. Chemistry help

    The vapor pressure of an organic solvent is 50 mm Hg at 25°C and 200 mm Hg at 45°C. The solvent is the only species in a closed flask at 35°C and is present in both liquid and vapor states. the system pressure is 760mmHg. Determine the mole fraction of

  10. chemistry -drbob222

    I'm not sure if my 1 and 2 are correct, and I don't know how to do 3, 4, and 5. Any help is appreciated! 1) You wish to extract an organic compound from an aqueous phase into an organic layer. to minimizing the number of transfer steps, would it be better

  11. Chemistry

    Biphenyl, C12H10, is a nonvolatile, nonionizing solute that is soluble in benzene, C6H6. At 25 °C, the vapor pressure of pure benzene is 100.84 torr. What is the vapor pressure of a solution made from dissolving 10.7 g of biphenyl in 33.9 g of benzene?

  12. PSYCHOLOGY

    provide a situation when scientific method, case study method, survey method, Naturalistic observation method, Correlation method, and Experimental method could be applied

  13. Chemistry

    Assume your sample spots are 1 cm above the bottom of the TLC plate. What happens if you put the plate in a developing chamber that has 1.2 cm of developing solvent? A. The solvent will move up the plate by capillary action faster. B. The sample spots will

  14. Hello

    why does fluorene elute first from the column

  15. Chemistry help

    a concentrated solution is one that has a. no solvent b. more solute than the solvent c. a high ratio of solute to solvent d. a low ratio of solute to solvent

  16. Organic Chemistry

    How would you purify Fluorene contaminated with ethyl-4-aminobenzoate? What method and solvent you would use? Please help...

  17. Best solvent?

    What is the best solvent for impure fluorene? The possibilities are methyl alcohol, water, and toluene. I'm betting toluene but I don't know its boiling point. Thanks from Sheryl My Merck Index lists 9H-Fluorene as freely soluble in glacial acetic acid and

  18. Chemistry

    Why is methanol a good solvent to recrystallize biphenyl?

  19. science (chem) Rf values

    consider a sample that is a mixture of biphenyl, benzoic acid, and benzyl alchohol. The sample is spotted on a TLC plate and developed in a methylene chloride cyclohexane mixture. Predict the relative Rf values for the three components in the sample. For

  20. chemistry

    When 0.451g of biphenyl (C12H10) undergoes combustion in a bomb calorimeter, the temperature rises from 26.7∘C to 29.6∘C.Find ΔErxn for the combustion of biphenyl in kJ/mol biphenyl. The heat capacity of the bomb calorimeter, determined in a separate

  21. science

    A sample of sucrose as been contaminated with sand.How would you purify the sucrose

  22. chemistry

    Suppose that a student calculated Kf of biphenyl to be 81.2C kg/mol. calculate the mass of an unknown if a solution containing 1.64 g of unknown in 18.22 g of biphenyl froze at 39.9 C

  23. Chemistry

    Assume you had used a well calibrated thermometer to measure the freezing point of a solvent, can you tell from the cooling curve if the solvent is contaminated with soluble material? If yes, how can you tell?

  24. chem 101

    Biphenyl (C1 2H1 0) burned in a bomb calorimeter in order to determine its heat of combustion. The heat capacity of the calorimeter was 5.86 kJ/°C When 0.514 g of biphenyl was burned, the temperature of the calorimeter increased from 25.8 °C to 29.4 °C.

  25. ochem

    Consider a sample that is a mixture composed of biphenyl, benzoic acid, and benzyl alcohol. Predict the order of elution of the components in this mixture on the TLC plate when solvent system a, b or c is used. a)Cyclohexane: Methylenechloride:100%:0%

  26. chemistry

    A sample of sucrose as been contaminated with sand.How would you purify the sucrose

  27. OChem

    1. Why does not fluorene dissolve in 1.5M sodium hydroxide solution? 2. What experimental difficulty would you encounter if you had neclected to include a drying step before evaporating the ether solution of the neutral organic compound (fluorene)?

  28. Microbiology

    What methods would you use to sterilize and clean a lab coat contaminated with a broth culture of Vibrio cholerae so that the lab coat could be safely used again? a. Method of sterilization: b. Method of cleaning: c. Name which method would be implemented

  29. chemistry

    When 0.558g of biphenyl (C_12H_10) undergoes combustion in a bomb calorimeter, the temperature rises from 25.7^\circ C to 30.1^\circ C. Find DeltaE_rxn for the combustion of biphenyl in kJ/mol biphenyl. The heat capacity of the bomb calorimeter, determined

  30. Chemistry

    If the solvent had been impure (that is, contaminated with soluble material); how woild this affect delta Tf (explain) and how would this effect the calculated molar mass?

  31. college chem

    Biphenyl, C12H10, is a nonvolatile, non ionizing solute that is soluble in benzene, C6H6. At 25 °C, the vapor pressure of pure benzene is 100.84 torr. What is the vapor pressure of a solution made from dissolving 14.3 g of biphenyl in 25.8 g of benzene?

  32. PSY 210

    Complete the following chart. The first column shows the name of a research method used in psychology. In the second column, write a brief description of that research method. In the third column, provide a situation when this method could be applied.

  33. science(chemistry) -Q for Dr.Bob

    solvent layer: 1 solid precipitate: no I ran the solvent layer I got in my unknown in the GC and I had sharp peaks in the beginning but at about 4 min on the polar column, I got a broad peak that tailed off considerably. question is, Is it water? I'm not

  34. chemistry

    a sample of indium chloride is known to be contaminated with sodium chloride. The contaminated sample weighs 2.87 g. When the contaminated sample is treated with excess AgNO3(aq), 5.79 grams of AgCl(s) are obtained. What is the percentage by mass of InCl3

  35. Science

    Biphenyl, C12H10, is a nonvolatile, nonionizing solute that is soluble in benzene, C6H6. At 25 °C, the vapor pressure of pure benzene is 100.84 torr. What is the vapor pressure of a solution made from dissolving 15.2 g of biphenyl in 29.5 g of benzene?

  36. science(chemistry)

    When performing vacuum filtration of a solid in an unknown solvent, is it necessary to go and find out the solvent composition, so that some fresh solvent can be used to wash the filtrate with?

  37. Chemistry

    how do you purify Biphenyl contaminated with Fluorene? what is the method and solvent?

  38. Organic Chemistry

    In an experiment, ligroin may be used as a solvent for the separation of the product from biphenyl. a. Can you suggest an alternative solvent that might be used in this step?

  39. Chemistry

    Biphenyl, C12H10, is a nonvolatile, nonionizing solute that is soluble in benzene, C6H6. At 25 °C, the vapor pressure of pure benzene is 100.84 torr. What is the vapor pressure of a solution made from dissolving 19.6 g of biphenyl in 25.1 g of benzene?

  40. Chemistry

    Biphenyl, C12H10, is a nonvolatile, non ionizing solute that is soluble in benzene, C6H6. At 25 °C, the vapor pressure of pure benzene is 100.84 torr. What is the vapor pressure of a solution made from dissolving 14.3 g of biphenyl in 25.8 g of benzene?

  41. Chemistry

    a water sample is suspected to be contaminated by Hg(II) ions. How could you determine if the sample is really contaminated?

  42. Chemistry

    For the Following sets of compounds determine the best solvent, by looking at structure, also by looking at solubility vs. temp. Which is the best solvent for crystalization, in which the compound is too soluble, and in which solvent the compound is not

  43. Organic Chemistry

    A student performs a crystallization on an impure sample of biphenyl. The sample weighs 0.5 g and contains about 5% impurity. Based on his knowledge of solubility, the student decides to use benzene as the solvent. After crystallization, the crystals are

  44. chemistry

    The vapor pressure of an organic solvent is 50 mm Hg at 25°C and 200 mm Hg at 45°C. The solvent is the only species in a closed flask at 35°C and is present in both liquid and vapor states. the system pressure is 760mmHg. Determine the mole fraction of

  45. Chemistry

    Which of the following results from the presence of a solute in a given solvent? A. The vapor pressure of the solution is lower than that of the pure solvent. B. The boiling point of the solution is lower than that of the pure solvent. C. The freezing

  46. Microbiology

    How would you disinfectant a plastic chair surface contaminated with blood in the hospital? (Please note in detail the steps required for personal protection, initial clean-up, follow-up disinfection, and the disposal methods of contaminated items.) a.

  47. chem 101

    Biphenyl (C1 2H1 0) burned in a bomb calorimeter in order to determine its heat of combustion. The heat capacity of the calorimeter was 5.86 kJ/°C When 0.514 g of biphenyl was burned, the temperature of the calorimeter increased from 25.8 °C to 29.4 °C.

  48. Logic

    Situation 1: You have eight billiard balls. One of them is "defective," meaning that it weighs more than the others. How do you tell, using a balance, which ball is defective in two weighings? Situation 2: You have five jars of pills. All the pills in one

  49. chemistry

    Biphenyl, C12H10, is a nonvolatile, nonionizing solute that is soluble in benzene, C6H6. At 25 °C, the vapor pressure of pure benzene is 100.84 torr. What is the vapor pressure of a solution made from dissolving 11.1 g of biphenyl in 29.1 g of benzene?

  50. Chemistry

    Biphenyl, C12H10, is a nonvolatile, nonionizing solute that is soluble in benzene, C6H6. At 25 °C, the vapor pressure of pure benzene is 100.84 torr. What is the vapor pressure of a solution made from dissolving 17.3 g of biphenyl in 34.0 g of benzene?

  51. Chemistry

    a solution of 0.2113 g of water dissolv ed in 25g of a solvent freezes at 11.5 degrees celcius below the freezing point of the solvent. what is the Kf for the solvent? A)0.735 B)1.36 c)5.39 D)24.5 Help!!! delta T = Kf*molality Calculate molality = #mols

  52. chemistry

    A solution of 0.2113 g of water dissolved in 25.0 g of a solvent freezes at 11.5 °C below the freezing point of the solvent. What is Kf for this solvent?

  53. Chemistry

    Biphenyl, C12H10, is a nonvolatile, nonionizing solute that is soluble in benzene, C6H6. At 25 °C, the vapor pressure of pure benzene is 100.84 torr. What is the vapor pressure (in torr) of a solution made from dissolving 16.6 g of biphenyl in 26.0 g of

  54. chemistry

    Which of the following statements is /are true? Answer a. None of he above. b. Impurities in a solvent raise the freezing point of that solvent c. All of the above d. Non-volatile impurities lower the boiling point of a solvent e. Ions lower the vapor

  55. math

    Terrell has a water purifier for backpacking. It will purify 1 liter of water in 1 minute. How long would it take Terrell to purify enough water for 4 canteens that each hold 750 mL, and two that each hold 1.5 L?

  56. chemistry

    Which solvent would dissolve each of the following compounds?(water, a polar organic solvent, or a nonpolar organic solvent) a) NaI b) H3CCH2CH2OH C)H3CCH2CH2CH2CH2CH2CH2CH3

  57. chemistry

    Which of the following solvents would most effectively dissolve a nonpolar gas like methane? a polar solvent at 10°C a polar solvent at 35°C a nonpolar solvent at 35°C a nonpolar solvent at 10°C is it a?

  58. Organic Chemistry

    Which statements are FALSE about selecting a solvent for recrystallization? (Select all correct answers.) Any solvent can be used for recrystallization as long as the compound dissolves in it. The compound should exhibit a high solubility in the solvent at

  59. Organic Chemistry

    How would you purify biphenyl contaminated with fluorene? What method and solvent would you use?

  60. Chemistry

    How would you purify decanoic acid contaminated with biphenyl? what method and solvent.Please help me

  61. Chemistry

    Ligroin may be used as a solvent for the separation of the product from biphenyl. a. Can you suggest an alternative solvent that might be used in this step?

  62. Chemistry

    considering the polarity of each compound and that of a solvent in which it is dissolved (including the potential for hydrogen bonding), give a brief explanation of each result: a) biphenyl in hexane - which is also soluble b) biphenyl in methyl alcohol -

  63. OCHEM

    A student needed to determine the percent composition of a mixture that contained fluorene and benzoic acid. The student took 245 mg of the mixture and used the extraction method to separate the components. Then both compounds were recrystallized and

  64. Chemistry Urgent Help Please!

    Give two means other than crystallization from a solvent that may be used to purify an organic solid. Explain Pleaseeeee!!!!!!!!!!!!!

  65. Microbiology

    How would you disinfectant a plastic chair surface contaminated with blood in the hospital? (Please note in detail the steps required for personal protection, initial clean-up, follow-up disinfection, and the disposal methods of contaminated items) a.

  66. Chemistry

    Aspirin can be prepared by the reaction of salicylic acid with an excess of acetic anhydride, using phosphoric acid as a catalyst. Once the aspirin is formed, it is precipitated from the reaction mixture by adding water and filtering. The solid aspirin

  67. Chemistry

    0.15 grams of benzene (C6H6) is dissolved into 4.7 grams of melted biphenyl. The freezing point of the mixture was determined to be 4.7 degrees below the freezing point of pure biphenyl. Based on these results, what is the Kf of biphenyl? (Use the standard

  68. chemistry

    0.24 grams of benzene (C6H6) is dissolved into 4.9 grams of melted biphenyl. The freezing point of the mixture was determined to be 4.4 degrees below the freezing point of pure biphenyl. Based on these results, what is the Kf of biphenyl? (Use the standard

  69. Chemistry

    If the freezing point of a pure solvent is 6.00 degrees Celsius, will the solvent which is contaminated with a soluble material have a freezing point (higher than, lower than or same as) 6.00 degrees Celsius? Explain.

  70. Chemistry

    What are the boiling point of a solution prepared by dissolving 2.40g of biphenyl(C^12H^10) in 75.0g of benzene? The molecular weight of biphenyl is 154..

  71. chem 101

    Biphenyl (C1 2H1 0) burned in a bomb calorimeter in order to determine its heat of combustion. The heat capacity of the calorimeter was 5.86 kJ/°C When 0.514 g of biphenyl was burned, the temperature of the calorimeter increased from 25.8 °C to 29.4 °C.

  72. Fluorenol (In the Merck Index or anywhere else)

    what is this? (Fluorenol) I can't find it in th Merck Index or online... I'm going to be using it in organic chem and I can't find the info to use in my chemical table.. Is it a combination of fluorene and alchohol? I just looked up fluorene and it said

  73. organic chemistry

    a compound you have prepared is reported in the literature to have a pale yellow color. when the substance is dissolved in hot solvent to purify by crystallization, the resulting solution is yellow. explain if you should us decolorizing charcoal before

  74. Orgo Lab

    Recrystallization is often used at the end of a synthesis. Choose the most accurate answer/s to explain the purpose of recrystallization and how it is done effectively? Note there may be more than one correct answer. 1.Dissolve the crude product in the

  75. Chem

    To purify acetanilide by a recrystallization procedure. a) Describe how you would decide what solvent to use in order to accomplish this objective. b) How you would calculate the effeciency of your recrystallization procedure with respect to; ---

  76. chemistry

    A solution is prepared with an unknown compound with an empirical formula of C3H7NO. The solution is made by dissolving 30.0 mg of compound in 1.200 g of the organic solvent biphenyl. The freezing point was depressed by 1.37C. What are the molar mass and

  77. Chemistry

    Biphenyl, C12H10, is a nonvolatile, nonionizing solute that is soluble in benzene, C6H6. At 25 °C, the vapor pressure of pure benzene is 100.84 torr. What is the vapor pressure of a solution made from dissolving 18.9 g of biphenyl in 26.4 g of benzene?

  78. Chem 2

    Biphenyl, C12H10, is a nonvolatile, nonionizing solute that is soluble in benzene, C6H6. At 25 °C, the vapor pressure of pure benzene is 100.84 torr. What is the vapor pressure of a solution made from dissolving 12.5 g of biphenyl in 27.9 g of benzene?

  79. chemistry

    Biphenyl, C12H10, is a nonvolatile, nonionizing solute that is soluble in benzene, C6H6. At 25 °C, the vapor pressure of pure benzene is 100.84 torr. What is the vapor pressure of a solution made from dissolving 19.9 g of biphenyl in 34.3 g of benzene?

  80. Pacific Union College

    Biphenyl, C12H10, is a nonvolatile, nonionizing solute that is soluble in benzene, C6H6. At 25 °C, the vapor pressure of pure benzene is 100.84 torr. What is the vapor pressure of a solution made from dissolving 17.5 g of biphenyl in 28.8 g of benzene?

  81. Organic Chemistry

    Which purpose does recrystallization serve? (Select all correct answers.) It is used to purify liquids. To separate unreacted solid starting materials from the solid target compound. To remove a solid from a liquid. It is used to purify solids. Improve the

  82. Chem

    A water sample is suspected to be contaminated by iron (III) ions. How could you determine if the sample is really contaminated?

  83. OChem

    A mixture of fluorene and benzoic acid is dissolved in diethyl ether and mixed thoroughly with an aqueous solution of NaOH. After the layers separate, what will each of the layers contain? Label the layers. Indicate the main components, not species that

  84. chemistry

    A solution of 0.2113 g of water dissolved in 25.0 g of a solvent freezes at 11.5 °C below the freezing point of the solvent. What is Kf for this solvent?

  85. math

    If half the batch of 6,000 vials are contaminated, what is the probability of finding no contaminated vials if only two vials are selected from the total amount produced?

  86. organic chemistry

    which of the 3 solvent would not be suitable recrystallization solvent for acetanilide? Why? - water as recrytallization solvent for acetanilide - chloroform as recrystallization solvent for acxetanilide - methanol as recrystallization solvent for

  87. Organic Chemistry

    Referring to solvent mixtures, which statements are TRUE ? (Select all correct answers.) The solvents of the solvent mixture should have very similar polarities. The solvents of the solvent mixture should have different polarities. The student has to pay

  88. Chemistry II

    A storage tank containing 1.6x10^4 Liters of water is found to be contaminated with nitric acid and therefore has a pH of 3.78. Calculate the volume of 0.050 M sodium hydroxide required to be added to the tank in order to neutralize (pH = 7.0) the

  89. science(chem)

    Consider the following errors that could be made when running the TLC. Indicate what should be done to correct the error. a) A 2 component mixture containing 1-octene and 1,4- dimethylbenzene gave only 1 spot with and Rf value of 0.95. The solvent used was

  90. Chemistry

    1) The molecular mass of a substance was determined by the freezing point depression technique. The minimum data required for the determination are a. ƒ´Tf and Kf only. b. ƒ´Tf , Kf and mass of solute. c. ƒ´Tf , Kf , mass of solute and mass of

  91. Chemistry

    a) Biphenyl, C12H10, is a nonvolatile, nonionizing solute that is soluble in benzene, C6H6. At 25 degrees Celcius, the vapor pressure of pure benzene is 100.84 torr. What is the vapor pressure of a solution made from dissolving 13.8 g of biphenyl in 32 g

  92. statistics 3

    Exercise #4 Quality control problem: According to U.S. News & World Report, a laboratory in Atlanta is processing snake venom for use in medical research. Five processing methods are being tested to determine which is least likely to contaminate the

  93. chemstry

    Give the industrial application of solvent as a method of separating mixtures

  94. CHemistry

    The vapor pressure of an organic solvent is 50 mm Hg at 25°C and 200 mm Hg at 45°C. The solvent is the only species in a closed flask at 35°C and is present in both liquid and vapor states. Determine the mole fraction of solvent in the gas phase.

  95. science (chem)

    consider a sample that is a mixture of biphenyl, benzoic acid, and benzyl alchohol. The sample is spotted on a TLC plate and developed in a methylene chloride cyclohexane mixture. Predict the relative Rf values for the three components in the sample. For

  96. Psy

    Complate the following chart. The first column shows the name of a research method used in psychology.In the second column, write a brief description of that research method. In the column, provide a situation when this method could be applied. Scientific

  97. psy210

    psy 210 CheckPoint: Research Methods Research Method Description Application Scientific method Case study method Survey method Naturalistic observation method Correlation method Experimental method

  98. CHEM

    Explain how micelles and more complex solutions work. Consider all Solute-solute, Solvent-solute and Solvent-solvent interactions in such a system.

  99. Chem

    Which of the following results from the presence of a solute in a given solvent? A. The vapor pressure of the solution is lower than that of the pure solvent. B. The boiling point of the solution is lower than that of the pure solvent. C. The freezing

  100. Organic Chem

    Q: Each of the solvent given should effectively separate one of the following mixtures by thin-layer chromatography. Match the appropriate solvent with the mixture that you would expect to separate well with that solvent. Select your solvent from the

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