Why Dissolving and then reforming crystals can improve
their purity?

Answers were Sorted based on User's Feedback



Why Dissolving and then reforming crystals can improve their purity?..

Answer / obuli

The basic recrystallization plan is to dissolve an impure
solid in ahot solvent, then cool the solution so that the
desired molecules recrystallize while the
impurities remain in solution. Subsequent filtration
separates the solid crystal from the liquid
solvent.temperature (so that the impurities are freed), but
weak enough so that at least some of your
sample crystallizes out after cooling (so that you get at
least some yield harvested.)

Is This Answer Correct ?    10 Yes 2 No

Why Dissolving and then reforming crystals can improve their purity?..

Answer / naveen gutta

Crystallization is a technique used to produce the purified form of the compound. Generally the purified form and the impurities will show different solubility characteristics in different solvents at different temperatures.Some compounds will dissolve at room temperature only and it can be recrystallized at a temperature less than RT. Usage of combination of two solvents (miscible/miscible depending on the solubility) is preferable for crystallization purpose.

Is This Answer Correct ?    1 Yes 1 No

Post New Answer

More Organic Chemistry Interview Questions

FDA MHRA

0 Answers  


What is the oxidation state of Cr in CrO5?

13 Answers   DS Group, Reddy Labs,


why 90ml hclreqired forpreparation of 1n hcl

3 Answers  


give an example of secondary standard (solution).

1 Answers  


whether ter weight is require when doing the water standerdisation

0 Answers  






What is reagent?

4 Answers   BSC, Hygro Chemicals,


How to convert esters to alcohols?

10 Answers   Biocon,


how u will separate aceticacid and benzoicacid ,but without water.

3 Answers  


what is the pH of benzene?why pH is not below 1

6 Answers  


What are the challenges and opportunities associated with handling and storing Protactinium due to its radioactivity and scarcity?

0 Answers  


What is a repartition coefficient?

0 Answers  


How many stereogenic centers are there in xylitol?

2 Answers  


Categories
  • Organic Chemistry Interview Questions Organic Chemistry (342)
  • Inorganic Chemistry Interview Questions Inorganic Chemistry (123)
  • Analytical Chemistry Interview Questions Analytical Chemistry (1387)
  • Physical Chemistry Interview Questions Physical Chemistry (62)
  • General Chemistry Interview Questions General Chemistry (478)
  • Chemistry AllOther Interview Questions Chemistry AllOther (190)