HomeworkLib
Question

Pure aspirin has a melting point of 135-136 °C. If aspirin crystals were not completely dried...

Pure aspirin has a melting point of 135-136 °C. If aspirin crystals were not completely dried before the melting point was determined, what effect could this have on the observed melting point?

Referring to above, if the dried aspirin sample is contaminated with a trace amount of acetaminophen (lit. MP 169-171 °C), what effect could this have on the observed melting point?

science   chemistry   
0 0
Add a comment Improve this question Transcribed image text
Next > < Previous
Sort answers by oldest

Homework Answers

Answer #1

If there is small amount of water is present then water will start boiling. And appear as a solvation effect. so you can not predict the melting point of aspirin. Since water will start boiling at around 95-100 OC. So in this condition you will measure the low melting point that anticipated at 135 OC.

If dried aspirin is contaminated with trace amount of acetaminophan then all aspirin will melt at 140-145 oC. Then you will think that aspiring started melting due to presence of acetaminophan. Albeit it already melted so in this condition you will not down the high melting point instead of 135 OC.

0 0
Add a comment
Know the answer?
Add Answer to:
Pure aspirin has a melting point of 135-136 °C. If aspirin crystals were not completely dried...
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for? Ask your own homework help question. Our experts will answer your question WITHIN MINUTES for Free.
Similar Homework Help Questions

  • someone help me with these 7 questions add a drop of iodine solution. If starch is present, I Wl iodine. The starch...

    someone help me with these 7 questions add a drop of iodine solution. If starch is present, I Wl iodine. The starch-iodine complex is deep blue-violet. Repeat this test with a com- mercial aspirin tablet and with the acetylsalicylic acid prepared in this experiment O N S at is the purpose of the concentrated phosphoric acid used in the first step? What would happen if the phosphoric acid were left out? 2. 1. Wh 3. If you used 250 mg...

  • Question 14 The melting point of a pure compound is known to be 110-111º. Describe the...

    Question 14 The melting point of a pure compound is known to be 110-111º. Describe the melting behavior expected if this compound is contaminated with 5% of an impurity. 90-96 111-113 90-91 110-111 5 pts Question 15 You and your lab partner take melting points of the same sample. You observe a melting point of 101-107°C, while your partner observes a value of 110-112°C. Explain how you can get two different values with exactly the same sample. One of the...

  • Powder (shor sten FUNNELS Fitering (long stem 63 Chapter 4 Melting Points, Boiling Points, and Refractive Indices Q...

    Powder (shor sten FUNNELS Fitering (long stem 63 Chapter 4 Melting Points, Boiling Points, and Refractive Indices Questions 1. What effect would poor circulation of the melting point bath liquid have on the observed melting point? 2. What is the effect of an insoluble impurity, such as sodium sulfate, on the observed melting point of a compound? 3. Three test tubes, labeled A, B, and C, contain substances with approxi- mately the same melting points. How could you prove the...

  • What would you expect the observed boiling point to be at 10 torrs of a liquid...

    What would you expect the observed boiling point to be at 10 torrs of a liquid which has a boiling point of 300 °C at 760 torrs? (Use Figure) Would it be possible to establish the composition of an unknown binary mixture of two substances from mixture melting-point data? Explain. After recording the R values using as a solvent system ethyl acetate and hexane (1:4), determine what solvent system is needed to obtain values between 0.3-0.4 for each of the...

  • Given that the final mass of acetaminophen crystals= 0.320g, - What is the percent recovery or...

    Given that the final mass of acetaminophen crystals= 0.320g, - What is the percent recovery or your product? - If this is above 100%, propose reasons for this. If not, list possible sources for the loss lf product. - What is the melting point (mp) of your product? The expected mp is 170C. What can you say about the purity of your product? The weight of the acetaminophen tablet is 500mg as stated in step#15. 133 Experiment 11 Isolation of...

  • 1. Eugenol (clove oil) has a reported boiling point of 255° C at 760 mm Hg....

    1. Eugenol (clove oil) has a reported boiling point of 255° C at 760 mm Hg. When making a determination of the boiling point at reduced pressures during vacuum distillations, a nomography chart can be used o determine the corrected boiling point. What would be the boiling point of Eugenol at 25 mm Hg? NOMOGRAPH 2. Aliquid mixture contains two substances whose boiling points are only 10°C apart. Which method of distillation should be utilized to obtain a clean separation...

  • 1. Abstract: Hamburg and leafy parsley were stored at ‐20 and ‐30°C for 9 months with...

    1. Abstract: Hamburg and leafy parsley were stored at ‐20 and ‐30°C for 9 months with or without blanching prior to freezing. We determined the vitamin C content by titration with 2,6‐dichlorophenolindophenol dye at several time intervals and storage conditions. The vitamin C content decreased over time and more when the freezing temperature was higher a. The purpose of the study is clearly stated. b. The experimental conditions are described. c. Scientific principles are described. d. The general conclusion of...

  • what is the theoretical yield of anisalacetophenone and dibenzalacetone formed? thank you. The Aldol Condensation Precautions:...

    what is the theoretical yield of anisalacetophenone and dibenzalacetone formed? thank you. The Aldol Condensation Precautions: Acetone, ethanol and acetophenone are flammable; work in a fume hood. Sodium hydroxide is a strong base and can cause severe skin burns and eye damage. Safety goggles are required. Gloves are recommended. Purpose To carry out two Aldol condensation reactions in which no heat is needed to obtain the condensation product. The two reactions differ in the number of enolizable protons at the...

  • Separating a Mixture, Recrystallization, pre-lab assignment could you also explain why you chose that substance for...

    Separating a Mixture, Recrystallization, pre-lab assignment could you also explain why you chose that substance for the empty spaces and question marks EXPERIMENT 4 Pre-Lab Assignment Separating a Mixture, Recrystalliration Name Date 1. Complete the following flowchart which shows how to separate a mixture of sand, sodium chloride and acetanilide. Notice that after a separation process (a down arrow) the filtered solids are shown on the left and the filtrate (the liquid) is shown on the right. The terminal step...

  • All of the following questions are in relation to the following journal article which is available...

    All of the following questions are in relation to the following journal article which is available on Moodle: Parr CL, Magnus MC, Karlstad O, Holvik K, Lund-Blix NA, Jaugen M, et al. Vitamin A and D intake in pregnancy, infant supplementation and asthma development: the Norwegian Mother and Child Cohort. Am J Clin Nutr 2018:107:789-798 QUESTIONS: 1. State one hypothesis the author's proposed in the manuscript. 2. There is previous research that shows that adequate Vitamin A intake is required...

ADVERTISEMENT
Free Homework Help App
Download From Google Play
Scan Your Homework
to Get Instant Free Answers
Need Online Homework Help?
Ask a Question
Get Answers For Free
Most questions answered within 3 hours.
ADVERTISEMENT
ADVERTISEMENT