I need some assistance with these assignment. how recrystallization works Thank you in advance for the help!
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I need some assistance with these assignment. how recrystallization works Thank you in advance for the help! Substances possess a range of melting points (recorded as true values, by literature). If a specific substance or compound is tested by melting and the resulting temperature obtained from its melted form during the process is different or significantly far from the theoretical value, then the substance may be claimed to contain impurities whose melting point interferes with that of the main substance. Thus, the purity of a compound may be determined through its melting point.
Through recrystallization, the solute quantity in which the solvent can dissolve varies directly with temperature. When the solute and solvent combine to form a solution near high temperature as the boiling T of solvent, the solubility of solute is enhanced so that the quantity of hot solvent need not be significant compared to that at lower temperatures. Then, upon the decrease in temperature, the solution becomes saturated with a lesser fraction of solute, and the solute which can no longer proceed into dissolution crystallizes into the pure substance desired.
The formation of white solid precipitate gives evidence of the reaction between the 6M HCl and the C9H7NaO4 solution. Such change took place because of further neutralization that results in the yield of aspirin (acetylsalicylic acid).
If the aqueous and organic layers were not properly mixed, the reaction would not be properly carried out. This would create less aspirin and more of the unknown because less of the aqueous solution would be created and separated out from the reaction.
If HCl was used to extract the dichloromethane rather than NaHCO3, the salt sodium acetylsalicylate would not have been formed from the reaction. The resulting compound would not separate the components into 2 layers because it would not have the same characteristics as the sodium acetylsalicylate and, therefore, would not be insoluble in dichloromethane.
(d) Instead of using pH paper, you neutralized the NaHCO3 to pH 7 using litmus paper.
If the solution were neutralized to a pH of 7 instead of using pH paper, the sodium acetylsalicylate would not be isolated as aspirin because the acidity of HCl is necessary in breaking apart the salt and donating its hydrogen in order to revert it back to aspirin. This would cause less aspirin to be obtained.