Explain the method of recrystallization

Assignment Help Chemistry
Reference no: EM13210571

A student has been given an impure substance for purification. After careful consideration, the student decides to se the method of recrystallization. What should be the characteristics for a good solvent that the student should consider? Identify them by circling those that apply:

A) It should dissolve the compound in a reasonable volume.

B) It cannot react chemically with the compound to be purified.

C) It should either dissolve impurities exceedingly well (so that they remain in solution even when cooled) or not at all (so they can be mechanically moved from the hot solution).

D) Ideally it should have a boiling point lower than melting point of solid to be purified in order to avoid a situation in which the solid melts but does not dissolve.

Reference no: EM13210571

Questions Cloud

What are the coordinates of the point : An agronomist wants to measure the rainfall at the centroid of a plowed field between two roads. What are the coordinates of the point where the rain gauge should be placed?
Impact of the reagan revolution on federalism : What was the impact of the Reagan Revolution on federalism and on the public's perception of the role of government?
Calculate the maximum length : The elevation of the lowest bottom of the structure is at 1470 feet. Calculate the maximum length (feet) of the parabolic curve required to meet the given conditions.
Determine the minimum necessary clearance height : Determine the minimum necessary clearance height of the overpass and the resultant elevation of the bottom of the overpass over the PVI. (ignore the cross-sectional width of the overpass)
Explain the method of recrystallization : After careful consideration, the student decides to se the method of recrystallization. What should be the characteristics for a good solvent that the student should consider? Identify them by circling those that apply:
Explain how the greenhouse effect works : Explain how the "greenhouse effect" works for a friend who has not taken an atmospheric sciences course. What is misleading about the use of the term "greenhouse effect"?
Determine the angular acceleration of the spool : determine the angular acceleration of the spool and the acceleration of the trailer. The wheels have negligible mass and are free to rotate.
Describes how market capitalization is determined : Which of the following accurately describes how market capitalization is determined?
Explain quick way to detect the presence of bromine chlorine : method would be a quick way to detect the presence of bromine/chlorine?

Reviews

Write a Review

Chemistry Questions & Answers

  How many grams of zn reacted

If 355 mL of hydrogen gas is collected over water at 25C at a total pressure of 751 mmHg, how many grams of Zn reacted?

  Compute the apparent milar mass of the hydrocarbon

A solution of 2.40 grams of the unknown hydrocarbon dissolved in 26.7 grams of naphthalene is found to freeze initialy at 76.2 Degree Celsius. Caluculate the apparent milar mass of the unknown hydrocarbon on the basis of the freezing-point depress..

  Questions on h-nmr spectrum of isopentyl acetate

Questions on H-NMR spectrum of isopentyl acetate - What would the effect on yield be of allowing the crushed Dry Ice to be exposed to the atmosphere for long periods of time before being used?

  Determine what is delta g o for the reaction

The gas phase dimerization reaction 2 NO2 = N2O4 has an equilibrium constant of Kc = 4.72 at 373 K (when all concentrations are measured in M units).

  What volume will hcl gas occupy at stp

A 550 mL volume of hydrogen chloride gas, HCl, is collcted at 27 degrees C and 790 mm Hg. What volume will it occupy at STP?

  Calculate the equilibrium concentration of oxygen

Suppose .30 mol of Ammonia and .40 mol of oxygen are added to a 5L container. If Y mol of water is present at equilibrium, calculate the equilibrium concentration of oxygen?

  Explain the decreasing melting point from naf to nai

Consider the following data: expect a BeF2 molecule to be linear but an SF2 molecule to be angular. Explain the decreasing melting point from NaF to Nai.

  How many grams of nac2h3o2 would have to be added

acetic acid has a Ka value of 1.8x10^-5. How many grams of NaC2H3O2 would have to be added to 100 ml of .1 M HC2H3O2 to prepare a buffer with a pH of 4.5?

  Compute a for a process in which an ideal gas expands

Calculate A for a process in which 0.160 mole of an ideal gas expands from 1.0 L to 3.5 L against a constant pressure

  What is the rate of change of the total pressure

The reaction 2NO(g) + Cl2 (g) -> 2NOCl(g) is carried out in a closed vessel. If the partial pressure of NO is decreasing at the rate of 21 torr/min, what is the rate of change of the total pressure of the vessel?

  What is the ph

if 400 ml of a 0.100M acetic acid and 200 ml of 0.100m solution acetate are mixed, what is the pH?

  How many molecules of carbon dioxide are produced

How many molecules of carbon dioxide are produced when 149 molecules of acetylene (HCCH) to react in excess oxygen produce carbon dioxide and water?

Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd