« previous next »

Author Question: You carefully purified phenanthrene from a very long, complicated procedure. It took days. It is ... (Read 56 times)

arivle123

  • Hero Member
  • *****
  • Posts: 569
on: Aug 23, 2018

You carefully purified phenanthrene from a very long, complicated procedure. It took days. It
  is very important for you to hand the purified phenanthrene in to your instructor in one hour
  to get a good grade. Oops You accidentally put the phenanthrene into a vial that you thought
  was clean but instead had a lot of NaCl clinging to the sides. What can you do to quickly
  purify the phenanthrene again?



Question 2

What is wrong with the following procedure?
  The reaction mixture, consisting of NaBr and an ethanol solution of the product, is diluted
  with an equal volume of water, then extracted once with an equal volume of diethyl ether. The
  lower aqueous layer is discarded.



LegendaryAnswers

  • Sr. Member
  • ****
  • Posts: 341
Reply #1 on: Aug 23, 2018
Answer to Question 1

Add a small amount of water to dissolve the NaCl and then extract into an organic solvent,
such as hexanes or methylene chloride.



Answer to Question 2

Ethanol is miscible with both water and diethyl ether. Therefore, a substantial amount of ethanol, diethyl ether, and product would be present in the discarded water layer. Before such an
extraction is carried out, most of the ethanol should be evaporated from the original mixture.



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

Though “Krazy Glue” or “Super Glue” has the ability to seal small wounds, it is not recommended for this purpose since it contains many substances that should not enter the body through the skin, and may be harmful.

Did you know?

Before a vaccine is licensed in the USA, the Food and Drug Administration (FDA) reviews it for safety and effectiveness. The CDC then reviews all studies again, as well as the American Academy of Pediatrics and the American Academy of Family Physicians. Every lot of vaccine is tested before administration to the public, and the FDA regularly inspects vaccine manufacturers' facilities.

Did you know?

Adults are resistant to the bacterium that causes Botulism. These bacteria thrive in honey – therefore, honey should never be given to infants since their immune systems are not yet resistant.

Did you know?

There are immediate benefits of chiropractic adjustments that are visible via magnetic resonance imaging (MRI). It shows that spinal manipulation therapy is effective in decreasing pain and increasing the gaps between the vertebrae, reducing pressure that leads to pain.

Did you know?

Glaucoma is a leading cause of blindness. As of yet, there is no cure. Everyone is at risk, and there may be no warning signs. It is six to eight times more common in African Americans than in whites. The best and most effective way to detect glaucoma is to receive a dilated eye examination.

The procedure for making a karyotype. The procedure for making a karyotype.
Urinary catheterization. The procedure involves the insertion of a flexible tube, or catheter, throu Urinary catheterization. The procedure involves the insertion of a flexible tube, or catheter, throu
Blocked at every turn by congressional Republicans who hated him, President Obama turned to techniqu Blocked at every turn by congressional Republicans who hated him, President Obama turned to techniqu
Hormones acting through the brain help regulate metabolism and short- and long-term appetite. Hormones acting through the brain help regulate metabolism and short- and long-term appetite.
Major Categories of Long-Term Memory Major Categories of Long-Term Memory
Part of a Semantic Network in Long-Term Memory Part of a Semantic Network in Long-Term Memory
Video: Properties of water -structure of water and polarity (Ionized and polar compounds)

For a complete list of videos, visit our video library