« previous next »

Author Question: You carefully purified phenanthrene from a very long, complicated procedure. It took days. It is ... (Read 68 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?

When intravenous medications are involved in adverse drug events, their harmful effects may occur more rapidly, and be more severe than errors with oral medications. This is due to the direct administration into the bloodstream.

Did you know?

Asthma attacks and symptoms usually get started by specific triggers (such as viruses, allergies, gases, and air particles). You should talk to your doctor about these triggers and find ways to avoid or get rid of them.

Did you know?

Pregnant women usually experience a heightened sense of smell beginning late in the first trimester. Some experts call this the body's way of protecting a pregnant woman from foods that are unsafe for the fetus.

Did you know?

As many as 20% of Americans have been infected by the fungus known as Histoplasmosis. While most people are asymptomatic or only have slight symptoms, infection can progress to a rapid and potentially fatal superinfection.

Did you know?

Every flu season is different, and even healthy people can get extremely sick from the flu, as well as spread it to others. The flu season can begin as early as October and last as late as May. Every person over six months of age should get an annual flu vaccine. The vaccine cannot cause you to get influenza, but in some seasons, may not be completely able to prevent you from acquiring influenza due to changes in causative viruses. The viruses in the flu shot are killed—there is no way they can give you the flu. Minor side effects include soreness, redness, or swelling where the shot was given. It is possible to develop a slight fever, and body aches, but these are simply signs that the body is responding to the vaccine and making itself ready to fight off the influenza virus should you come in contact with it.

The roles of transpiration, cohesion, adhesion, and tension in long-distance water transport. The roles of transpiration, cohesion, adhesion, and tension in long-distance water transport.
Photograph taken during a laparoscopic procedure. The fundus of the uterus is visible below the prob Photograph taken during a laparoscopic procedure. The fundus of the uterus is visible below the prob
Solution (Polynomial Long Division) Solution (Polynomial Long Division)
Gram Stain Procedure Diagram Gram Stain Procedure Diagram
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.
A very thin uniform rod, 2.40 m long and of weight 135 N, has a frictionless hinge at its lower ... A very thin uniform rod, 2.40 m long and of weight 135 N, has a frictionless hinge at its lower ...
Video: Proteins

For a complete list of videos, visit our video library