Avatar for Sourav Pan
Sourav Pan
23 Apr 2025

1. Briefly explain why you should not heat organic solvents over a Bunsen burner flame. 2. Indicate a procedure to solve the following recrystallization problems. (a) oiling out (b) lack of crystal formation (c) presence of colored impurities 3. Compound A, a white crystalline solid with a melting point of 75°C, has the solubility profile shown in the following table. Which of the solvents listed would be a good recrystallizing solvent for Compound A? Briefly explain. Compound A — solubility profile solvent solvent boiling pt. solubility at 25°C solubility at boiling point water 100. c insol. sol. methanol 65°C insol. sol. acetone 56°C sol. sol. diethyl ether 35°C sol. sol. 4. A student purified a 500. mg sample of phthalic acid by recrystallization from water. The published solubility of phthalic acid in 100. mL of water is 0.54 g at 14°C and 18 g at 100.°C. You must show your calculations for the questions below. (a) What is the smallest volume of boiling water the student could use to dissolve 500. mg of phthalic acid? (b) Dissolution of phthalic acid in boiling water produced a clear solution. The student allowed the solution to cool, then put the solution in an ice bath. Crystals formed, and the student isolated 380 mg of phthalic acid. Calculate the percent recovery of phthalic acid in this experiment.

1. Briefly explain why you should not heat organic solvents over a Bunsen burner flame. 2. Indicate a procedure to solve the following recrystallization problems. (a) oiling out (b) lack of crystal formation (c) presence of colored impurities 3. Compound A, a white crystalline solid with a melting point of 75°C, has the solubility profile … Read more

Avatar for Sourav Pan 1 Answer
Welcome to our Q&A page! Here, you can find answers to frequently asked questions about our courses, features, and other topics related to our content. If you have a question that's not covered, feel free to ask, and we'll be happy to help!

Quiz Leaderboard

1st
Meenakshi
Score: 100%
Questions: 20
2nd
Debabrata
Score: 100%
Questions: 20
3rd
BandzzzzTheONESIMELANE
Score: 95%
Questions: 20
4th
Sourav
Score: 90%
Questions: 20
5th
Nischal
Score: 90%
Questions: 10
6th
Priyanka
Score: 90%
Questions: 10
7th
OTLOTLENG
Score: 70%
Questions: 10
8th
Martin
Score: 65%
Questions: 20
9th
Meenakshi
Score: 60%
Questions: 50
10th
Meenakshi
Score: 55%
Questions: 20
  • Click "Create Mock Test" to start a quiz.
  • Select categories and the number of questions, then click "Submit" to begin.
  • After completing the quiz, enter your name and email, then click "Submit" to view your score.
  • Your score is shown as a percentage (e.g., 5 correct out of 10 is 50%).
  • The leaderboard displays your name, score percentage, and total questions answered.
400
Questions in this Category

Top Questions

⚠️
  1. Click on your ad blocker icon in your browser's toolbar
  2. Select "Pause" or "Disable" for this website
  3. Refresh the page if it doesn't automatically reload