This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: A student started with 100 mg of an unknown solid and recrystallized this material from water. The ... (Read 40 times)

Destiiny22

  • Hero Member
  • *****
  • Posts: 557
on: Aug 23, 2018
A student started with 100 mg of an unknown solid and recrystallized this material from water. The weight of the crystals they isolated was 27 mg. Explain why the student might have obtained this result and what the student can do to try to correct the problem.

Question 2

A student started with 100 mg of an unknown solid and recrystallized it from water. The weight of the crystals isolated was 120 mg and the melting point range was very broad and lower than the literature value. Explain the problem that the student encountered and how the student can solve it.


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

14vl19

  • Sr. Member
  • ****
  • Posts: 310
Reply #1 on: Aug 23, 2018
Answer to Question 1

The hot solution was probably not saturated and therefore recrystallization would be inefficient. They should attempt to obtain a second crop of crystals by concentrating the mother liquors.

Answer to Question 2

The crystals are most likely wet with the solvent used for recrystallization. The student should let the crystals dry until the weight is constant and then recheck the melting point.


Destiiny22

  • Member
  • Posts: 557
Reply 2 on: Aug 23, 2018
:D TYSM

kalskdjl1212

  • Member
  • Posts: 353
Reply 3 on: Yesterday
YES! Correct, THANKS for helping me on my review

« previous next »
 

Did you know?

It is widely believed that giving a daily oral dose of aspirin to heart attack patients improves their chances of survival because the aspirin blocks the formation of new blood clots.

Did you know?

Symptoms of kidney problems include a loss of appetite, back pain (which may be sudden and intense), chills, abdominal pain, fluid retention, nausea, the urge to urinate, vomiting, and fever.

Did you know?

Long-term mental and physical effects from substance abuse include: paranoia, psychosis, immune deficiencies, and organ damage.

Did you know?

The human body produces and destroys 15 million blood cells every second.

Did you know?

In inpatient settings, adverse drug events account for an estimated one in three of all hospital adverse events. They affect approximately 2 million hospital stays every year, and prolong hospital stays by between one and five days.

NaCl crystals dissolving in water NaCl crystals dissolving in water
Air pressure under water Air pressure under water
Chéri Samba, Problème d'eau. Où trouver l'eau? (The Water Problem. Where to Find ... Chéri Samba, Problème d'eau. Où trouver l'eau? (The Water Problem. Where to Find ...
How water is used in homes How water is used in homes
Solid Drug Forms Solid Drug Forms
An 80-g aluminum calorimeter contains 380 g of water at an equilibrium temperature of A piece ... An 80-g aluminum calorimeter contains 380 g of water at an equilibrium temperature of A piece ...
Video: How does asthma work?And How do you treat asthma?

For a complete list of videos, visit our video library