the melting point of pure benzoic acid and pure naphthol are 122.5 and 123 degree Celsius respectively. you are given a pure sample that is known to be either pure benzoic acid or 2- naphthol. describe a procedure you will

49,761 results
  1. Physics

    A faulty celcius thermometer read 0.7 degree celcius at the melting point of pure ice and 99.5 at the boiling point of water at normal pressure. Calculate the correct temperature when it reads 30 degree celcius. At what temperature will its reading be

  2. chemistry

    calculate the freezing point of a solution of a 3.46g of a compound, X, in 160g of benzene. when a separate of X was vaporised, its density was found to be 3.27g/L at 116 degree Celsius and 773 torr. The freezing point of pure benzene is 5.45 degree

  3. orgo

    A sample of naphthalene, which should be pure white, was found to have a grayish color after the usual purification procedure. The melting point was correct, and the melting point range was small. Explain the gray color.

  4. science

    the melting point of pure benzoic acid and pure naphthol are 122.5 and 123 degree Celsius respectively. you are given a pure sample that is known to be either pure benzoic acid or 2- naphthol. describe a procedure you will use to determine the identity of

  5. physics

    A faulty Celsius thermometer reads 0.7 at the melting point of pure ice and 99.5 degree Celsius at the boiling point of water at normal pressure. (a) what is the correct temperature when it read 60 degree Celsius. (b) at what temperature will it's

  6. Chemistry

    Explain why pure dry benzoic acid does not affect a litmus paper

  7. Organic Chemistry

    The separation of a mixture of benzoic acid and benzoin in dichloromethane into its pure compounds by a combination of solvent extraction , distillation and recrystallization. Why is carbon dioxide evolved when the organic solution is shaken with sodium

  8. chemistry

    required to heat 38.0 g of copper (cu) from 122 degree celsius to 246 degree celsius

  9. AP CHEMISTRY

    A)In a chemical reaction two gases combine to form a solid. What do you expect for the sign of ΔS? B) For which of the following processes does the entropy of the system increase? (Select all that apply.) -> alignment of iron filings in a magnetic field

  10. CHEMISTRY- PLEASE HELP:)!

    Pure lauric acid is melted and the freezing point is determined to be 43 degrees celsius. A solution is made by dissolving .50 grams of paradicholrobenzene into 3.00 grams of lauric acid. Determine the molality of this solution. I got 1.1m. which is right.

  11. organic chemistry

    2. An unknown white solid has melting point range 119 – 121o C. Benzoic acid is a white solid of 122 o C melting point. How can a student confirm the identity of the unknown solid (is the benzoic acid or not)

  12. chem

    1.) When determining the melting point it's described in my text as recording 2 points in the melting process. a) when the first drop of liquid is seen b) when all of the compound is liquified and since I have to determine the melting point of

  13. Chemistry

    The melting point of aspirin : 128-137Celsius degree. The melting point of the crude aspirin was measured to be 128 Celsius degree. What does it indicate about the purity of the product?

  14. chemistry

    Urgent. The melting point of pure acetylsalicylic acid is 135 degrees celsius. Comment on the purity of your product based on its melting point range. My melting point range was 105-115. I do not even know where to start for this question. Could you please

  15. chemistry

    explain why pure dried benzoic acid does not affect litmus paper

  16. Chemistry

    Imagine that you have a pure sample of an unknown compound that you are told is either 2-naphthol OR benzoic acid. In the lab, you also have access to samples of pure 2- naphthol and pure benzoic acid. However, both of these pure substances melt at 123

  17. organic chem/ melting pt lab

    why does a soluble impurity reduce the melting point range of a pure compound ? why is it advisable to run a mixed melting point determination on samples of two different compositions before concluding that the two compounds are identical ?

  18. Science chemistry

    Which compound has the melting point of -23 degree Celsius and boiling point of 77 degree Celsius ? Thx....

  19. science

    which substance has a melting point of -219 degree celsius and boiling point of -183 celsius at room temperature 30 degree celsius

  20. science

    at 30 degree celsius , the solubility of ag2co3 (Ksp= 8 * 10^-12) would be maximum in 1 litre of ? a) pure water b) 0.05 M NH3

  21. chemistry

    calculate what volume of sulfuric acid solution(specific gravity=1.07;and containing 10%sulfuric acid by mass)contains 18.50g of pure sulfuric acid at a temperature of 25 Celsius.

  22. chemistry ap

    Why would [23.8-(.0588)(23.8)] be the proper setup to determine the vapor pressure of a solution at 25 Celsius that has 45g of C6H12O6, glucose (MM=180gxmol^-1), dissolved in 72g of H2O? The vapor pressure of pure water at 25Celsius is 23.8 torr. vp pure

  23. college algebra word problem

    A goldsmith has two alloys that are different purities of gold. The first is 3/4 pure and the second is 5/12 pure. How many ounces of each should be melted and mixed in order to obtain a 6 oz mixture that is 2/3 pure gold?

  24. ochem

    You have a mixture composed of 90% benzoic acid and 10% naphthalene. Benzoic acid has a melting point of 122.4 oC, while naphthalene has a melting point of 80.2 oC. You can say with certainty that the melting point of the mixture will be: A. greater than

  25. Chemistry

    Cocaine is a non-electrolyte that has a molecular weight of 303.4 g/mole. How many grams must be dissolved in 25.0 mL of Chloroform (density = 1.484 g/mL) to raise its boiling point to 65.5 Celsius? The boiling point of pure Chloroform is 61.2 Celsius. Kb

  26. math

    60 ml of solution A is mixed with 120 ml of solution B to produce solution C which contains 8% of pure acid. If 80ml of solution A is mixed with 40ml of solution B, a solution D containing 10% of pure acid can be produced. find the percentage of pure acid

  27. algebra

    A chemist mixes some 20% acid solution with pure 100% acid to increase the concentration. How much pure acid and acid solution should be mixed to form 100 milliliters of 40% acid solution?

  28. Chemistry

    An unknown compound X is one of the four compounds listed in the table below. A mixture of X with o-toluic acid melts at 100 degrees Celsius, a mixture of X with benzoic acid melts at 112 degrees Celsius, a mixture of X with phenyl succinate melts at 110

  29. chemistry

    how can you separate pure benzoic acid from a mixture of benzoic acid and sand?

  30. chemistry

    a student dissolves 0.625 g of pure benzoic acid in distilled water and titrated the resulting solution to the equivalence point using 40.8 mL of the standardized NaOH solution from Part a, assuming that benzoic acid has only one ionizable hydrogen, answer

  31. Portions and integers

    I need help please. Mercury is a metal that is liquid at room temperature. Its melting point of -39 degrees Celsius. The melting point of isopropyl alcohol is -89 Celsius. (Part A) In the context of this problem, what does zero mean ? (I think it just

  32. Science

    Compounds with high melting points have ___ a. Covalent bonds b. Metallic Bonds c. Ionic bonds*** d. No chemical bonds How could you determine if a sample of gold is pure? Compare the sample's density with that of pure gold.*** Compare the sample's color

  33. Science

    The melting point of pure benzoic acid and pure naphthol are 122.5 *C and 123 *C respectively. You are given a pure sample that is known to be either pure benzoic acid or 2- naphthol. Describe a procedure you will use to determine the identity of the

  34. Chemistry-Organic

    explain the difference in melting point in terms of intermolecular forces involved: 1) Hexane(C6H14) m.p. = -96*C) vs octadecane(C18H38) m.p. = 28 - 30*C) 2) toluene((Ph-CH3) m.p. = 5.5*C) vs benzoic acid((Ph-CO2H) m.p. = 122.4*C) 3) benzoic acid((Ph-CO2H)

  35. Physics

    A 40 Celsius the thermometer leads to 0.7 degree Celsius at the melting point or pure ice and 98.5 degree Celsius at the boiling point of water at abnormal pressure what is the correct temperature when it leads 30 degree Celsius (b) At what temperature is

  36. chem

    What does the concentration of the benzoic acid in the original liquid and the extracting liquid relate to after the extraction is completed? Answer a. The density of the original liquid. b. The density of the extracting liquid. c. The solubility of

  37. Science

    A 0.25kg block of pure material is heated from 20 degree Celsius to 65 degree Celsius by the addition of 4.35 killer Jules of energy . Calculate the specific heat and identify the substance it is most likely composed

  38. math

    metal mercury at room temperature is a liquid. melting point is 39 degree celsius.freezing point of alcohol is 114 degree celsius.how mu7ch warmer is the melting point of mercury than the freezing point of alcohol

  39. Chemistry

    Calculate the expected freezing point of a solution of 0.579 g pelargonic acid in 4.225 g of lauric acid, if the melting point of pure lauric acid was measured to be 43.20*C. (MM pelargonic acid = 158.2 g/mol; MM laruic acid = 200.32 g/mol). Kf for lauric

  40. chem

    If 20.5 mL of a 5.256 M solution of benzoic acid is used in an experiment similar to experiment 4, how many grams of benzoic acid is in the starting solution? (molar mass of benzoic acid = 122.12 g/mol) Be sure to pay attention to significant figures. The

  41. chemistry

    a sample of water under study was found to boil at 102 degree Celsius at normal temperature and pressure. is the water pure ? will it freeze at 0 degree Celsius? comment ....

  42. Chemistry

    Mols benzoic acid = 12.2g/122.12g = 0.0999 Int. Concentration of Benzoic acid = 0.0999 mol/ 0.500L = 0.1998 M Ka = 6.3 x 10-5 = (x)(x)/0.1998 – x X = [H+] = * M pH = -log(*) = * Sorry, this question is just really confusing me..

  43. CHEMISTRY

    The solubility of a compound in water is 6.8g/100ml at 0.33g/100ml at 25 degree celsius. Calculate the amount of water required to crystallise 10g of the compound. If the pure compound is collected at 25 degree celsius, what is the maximum possible yield

  44. chemistry

    Cocaine is a non-electrolyte that has a molecular weight of 303.4 g/mole. How many grams must be dissolved in 25.0 mL of Chloroform (density = 1.484 g/mL) to raise its boiling point to 65.5 Celsius? The boiling point of pure Chloroform is 61.2 Celsius. Kb

  45. chemistry

    at one atmosphere pure water ice melts at 0.0 C. at 12 atm the melting point is -0.085 C. The density of water is 1g.cm^3 at 0 C, while that of ice is 0.917 g/cm^3. From this information, estimate entropy of melting.

  46. Chemistry

    A sample of naphthalene, which should be pure white, was found to have a grayish color after the purification procedure. The melting point was correct but the melting point range was smaller. Why the gray color? Is it possible the "purification procedure"

  47. chemistry

    a sample of sulphuric acid is 95.7% by mass and has a density of 1.84g/cubic cm.calculate the mass of pure H2SO4 in a 2.00L bottle and volume of acid that contain 200g of pure H2SO4.

  48. Math - Alg

    How much pure acid must be added to a 30% acid solution to make a 60L solution which is 50% acid? This was the answer I got from Reiny. amount of pure acid to be added -- x L 1(x) + .3(60-x) = .5(60) 10x + 3(60-x) = 5(60) 10x + 180 - 3x = 300 7x = 120 x =

  49. 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

  50. Analytical Chemistry

    Just curious: The melting point of pure benzoic acid and pure naphthol are 122.5 *C and 123 *C respectively. You are given a pure sample that is known to be either pure benzoic acid or 2- naphthol. Describe a procedure you will use to determine the

  51. chemistry

    Pure acetylsalicylic acid has a melting point of 135.0 - 135.5 (degrees Celsius). What would you expect for the melting point is this was mixed as a 50:50 mixture with pure benzoic acid (melting point 121 - 122)? Explain.

  52. Organic Chemistry!!!

    pure acetylsalicylic acid has a melting point of 135.0 - 135.5 degreed celsius. what would you expect to happen to the melting point if this was mized as a 50:50 mixture with pure benzoic acid (mp 121 - 122)

  53. Chemistry

    You are given a pure sample that is known to be either pure benzoic acid or 2- naphthol. Describe a procedure you will use to determine the identity of the sample.

  54. ORG CHEM LAB

    Im doing a conclusion on a lab of acetaminophen. We were to take a melting point of the crude smale of acetaminophen and melting point of the crystallized acetaminophen. The mp for crude sample: 169.2 degree C The mp for crystallized sample: 172. degree C

  55. Chemistry h/w

    Hi, this is my first lab in 2nd semester of chemistry, and im not sure about my answers in the assignment can someone give it a quick look to check them? this is my phase diagram: tinypic. com/view.php?pic=1605yev&s=7 p.s. ignore the lone red dot its

  56. chemistry h/w

    Hi, this is my first lab in 2nd semester of chemistry, and im not sure about my answers in the assignment can someone give it a quick look to check them? this is my phase diagram: tinypic. com/view.php?pic=1605yev&s=7 p.s. ignore the lone red dot its

  57. Chemistry

    I was asked to write up the experiment that we did in class, but i was absent that day, and i really don't know anything about it, could someone please help me, the title of the experiment says : To obtain a pure sample of benzoic acid form an impure

  58. Physic

    faulty Celsius thermometer reads 0.7 at the melting point of pure ice and 99.5 degree Celsius at the boiling point of water at normal pressure. (a) what is the correct temperature when it read 60 degree Celsius. (b) at what temperature will it's

  59. chem

    A student in 51LA conducts a melting point experiment with an unknown compound and observes a melting range of 122 – 129 °C. Is this a typical range for a melting point? If not, what range would be typical? Well for a pure compund the meliting range is

  60. organic chemistry

    breifly describe how you would separate a mixture of sand and benzoic acid(benzoic acid is soluble in hot water) to obtain pure benzoic acid

  61. physics

    A faulty Celsius thermometer read 0.7degrees Celsius at melting point of pure ice and 99.5degrees Celsius at boiling point of water at normal pressure. What is the correct temperature when it reads 30 degrees Celsius

  62. math statistic

    One of your friends knows that you are taking Advanced Placement Statistics and asks for your help wither Chemistry lab report. She has come up with five measurements of the melting point of a compound: 122.4, 121.8, 122.0, 123.0, and 122.3 degrees

  63. math

    When a chemist dilutes pure acid with another substance, the resulting mixture is no longer pure acid. Consistent with the words, pure acid is 100% acid. So, there are 20 grams of pure acid in 20 grams of a pure-acid solution. Laura, a chemist, has 20

  64. Chemistry

    Enough water is added to 0.35 g of benzoic acid to make 1000 mL of solution. What is the pH? Ionization Constant for Benzoic Acid Ka = 6.5 × 10–5 Molar Mass Benzoic Acid 122. g·mol–1 (A) 1.9 (B) 2.6 (C) 3.4 (D) 4.2

  65. Chemistry

    A compound containing only boron, nitrogen, and hydrogen was found to be 40.3% B, 5202% N, 7.5% H by mass. If 3.301g of this compound is dissolved in 50.00g of benzene, the solution produced freezes at 1.30 degree celsius. if the freezing point depression

  66. chemistry

    in relation to the pH of pure water at 25 degree Celsius where do the pH values of acid fall

  67. university chemistry

    many cola soft drinks contain caffeine and benzoic acid (pKa 4.2), explain how you would isolate separately pure caffeine and benzoic acid from an aqueous solution containing both compounds

  68. chemistry

    Describe how you would determine the melting point of a salt of benzoic acid with melting point of 170°c

  69. Chemistry

    Why does pure dry benzoic acid does not affect a litmus paper

  70. chemistry

    explain why pure dry benzoic acid do not affect litmus paper

  71. chemistry lab

    why would it not be useful to just use pure ethanil or pure ethylene glycol as aN ANTIFREEZE SINCE THEIR NORMAL FREEZING POINTS are -114.1 degrees celsius and -12 degrees celsius respectively

  72. chemistry

    why would it not be useful to just use pure ethanil or pure ethylene glycol as aN ANTIFREEZE SINCE THEIR NORMAL FREEZING POINTS are -114.1 degrees celsius and -12 degrees celsius respectively

  73. chemistry

    why would it not be useful to just use pure ethanil or pure ethylene glycol as aN ANTIFREEZE SINCE THEIR NORMAL FREEZING POINTS are -114.1 degrees celsius and -12 degrees celsius respectively

  74. Math

    You are working in a chemistry lab. You have 1000 milliliters of pure acid. A dilution of acid is created by adding pure acid to water. A 40% dilution contains 40% acid and 60% water. You have been asked to make a 40% dilution and a 60% dilution of pure

  75. Chemistry

    You have synthesized a substance from aqueous solution that has a melting point of 152 °C. A pure authentic sample of the intended product has a melting point of 154 °C. The most likely explanation for the difference in melting temperature is that the

  76. Definitions....

    What is pure liquid? What is impure liquid? Thx You are going to have to define these in context. "Pure" is a relative term. For instance, the term "pure" water...is it really pure? It depends on the definition of pure being used. Pure liquid could mean

  77. Chemistry

    A sample of benzoic acid contaminated with NaCl and sand is to be recrystallized: Benzoid Acid: Solubility in water at 100 degrees Celsius in g/100 mL = 6.8, at 0 degrees Celsius in g/100 mL = 0.2. NaCl: Solubility in water at 100 degrees Celsius in g/100

  78. Chemistry

    Hey! I'm having difficulty trying to identify what "types" of substances Ascorbic Acid and Palmitic Acid are. My teacher says that "only metallic and covalent network solids (these two are solid at room temp) are electrically conductive". Furthermore, she

  79. chemistry

    a 225.0g sample of an unknown, silver, pure metal was heated to 95.5 degrees Celsius and then put into 150.50g of water at 22.5 degree Celsius. the water was heated by the hot metal to a temp. of 31.4 degree Celsius. what is the specific heat of the metal

  80. chemistry

    Benzoic Acid (HC6H5OO, 122.0 g/mol) has a Ka = 6.3 x 10-5. What is the pH of a solution that has 3.050 g of benzoic acid in enough water to make a 0.250 L solution?

  81. Chemistry

    If we wish to find the molar mass of a pure solid organic compound, which measurement would be most useful and why? A)melting point of the solid B)melting point depression of the mixture of the solid with 1,4-dichlorobenzene C)Heat of combustion

  82. chemistry

    Given 20g of benzoic acid contaminated with 0.4g of salicytic acid. 1)Determine the volume of hot water required to dissolve the mass of acid. 2)Calculate the mass of benzoic acid which participates when the solution is cooled to 20°C. Deduce. 3)Calculate

  83. Chemistry

    The melting point of a pure solvent (kf=1.79°C/m) is -116.3°C. If 312 g of an ionic solid (i=2.6) is added to 567.7 g of the solvent, the new melting point is -101.6°C. What is the molar mass of the ionic solute?

  84. science

    which has a lower ph pure water that is hot or pure water that is cold? is it possible for water to be neutralbut have a ph less than or greater than 7.0? how readily an acid donates a hydrogen is a fuction of how well the acid is able to accomodate the

  85. chemistry

    Im doing my lab report about steam distillation? and its asking me how i can tell if the two compounds i steam distilled are pure. but im not sure how to tell? i mean is the volatile or the nonvolatile compound the pure compound? or maybe the boiling point

  86. algebra 2

    A chemist mixes some 20% acid solution with pure 100% acid to increase the concentration. How much pure acid and acid solution should be mixed to form 100 milliliters of 40% acid solution?

  87. Organic Chemistry

    Why is the melting point of a known compound (ex. acetanilide) determined before the melting point of the unknown compound? I think it is to determine if the unknown is a pure substance but I am not sure..I just need to be pointed in the right direction.

  88. Chemistry

    Here's is what I did: Collect water samples from Farm Lane bridge (500 mL minimum)þ Filter water samples using small mesh filter Note: Weigh the dried filter before filtration! Dry the filter in drying oven (~24 hours)þ Weigh the filter after drying. Day

  89. Chemistry

    Here's is what I did: Collect water samples from Farm Lane bridge (500 mL minimum)þ Filter water samples using small mesh filter Note: Weigh the dried filter before filtration! Dry the filter in drying oven (~24 hours)þ Weigh the filter after drying. Day

  90. chemistry

    is the melting point determination of crude benzoic acid recyustalization is higher or lower?

  91. chemistry

    A sample of benzoic acid weighting 1.567 g was burned in a calorimeter. If the initial temperature was 22 degrees Celsius,the final temperature was 31.1 degrees celsius, and the heat capacity of the calorimeter was 4.88 kJ/ degrees Celsius, what is the

  92. Melting point

    Do you have any idea what the melting points and range might be for a 50/50 mixture of: 1. Benzoin (M.P.: 135-136) and succinimide M.P.: 121-123 and 2. Benzoic acid M.P.: 121-122 and succinimide M.P.: 122-124 I'm doing a lab with really laughable melting

  93. Chemistry

    The solubility of a compound in water is 6.8g/100ml at 0.33g/100ml at 25 degree celsius. Calculate the amount of water required to crystallise 10g of the compound. If the pure compound is collected at 25 degree celsius, what is the maximum possible

  94. Chemistry

    The solubility of a compound in water is 6.8g/100ml at 0.33g/100ml at 25 degree celsius. Calculate the amount of water required to crystallise 10g of the compound. If the pure compound is collected at 25 degree celsius, what is the maximum possible

  95. Chemistry

    The solubility of a compound in water is 6.8g/100ml at 0.33g/100ml at 25 degree celsius. Calculate the amount of water required to crystallise 10g of the compound. If the pure compound is collected at 25 degree celsius, what is the maximum possible

  96. science

    you have pure silver in your hand and its 10.5 g/cm^3 at 20 degrees celsius. you get handed pure silver that's 9.9g/cm^3 and its also at 20 degrees celsius. what happened?

  97. Sociology

    Please help me on this question. I am very stuck! 1. Prepare a chart which compares the basic characteristics of the pure capitalist and pure socialist economic models. Please help me; compare characteristics of pure capitalist and pure socialist. Thanks

  98. 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

  99. Chem Lab Help

    Separation and purification A mixture of benzoic acid, benzaldehyde and butylamine. What kind of experiment should you design to obtain each of the three compounds in a pure state. Just need ideas in order to start this experimental design. Thanks!!!

  100. o.chem

    I did an experiment for extraction of acetylsalicylic acid from an aspirin tablet(632mg mass). The solvent used was dichloromethane. I got about 342mg from the 500mg that could be extracted. the melting point found for this sample was 118-120°C as

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