16 Questions
What is the saponification method used for?
Determining the esters present in essential oils
What is the purpose of refluxing a sample with KOH dissolved in alcohol in the saponification method?
To convert ester to alcohol and carboxylic acid
What is the purpose of using a standard acid solution in the saponification method?
To neutralize the excess amount of alkali
When can aqueous solution of NaOH or KOH be used for ester hydrolysis?
When esters are soluble in water and are easily saponified
What can be determined if the molecular weight of ester is known in the saponification method?
The number of acetyl groups in a sample
What is the saponification equivalent?
The ester weight in gram that reacts with 1 gram equivalent of a strong base
What is used to estimate the amino group in organic compounds?
Acetylation method
Which method involves the reaction of excess bromate-bromide solution with an amine sample in the presence of HCl?
Bromination method
What is used for readily hydrolysed esters?
Absolute ethanol
Which solvent can be used to increase the reaction rate in a solution of KOH?
High boiling point solvents
What is the excess acetylating mixture hydrolyzed with in the acetylation method?
Water
Which method involves titrating a sample with standard acid to the neutral point, then adding bromophenol blue indicator and benzene to reach a green end point?
Double-indicator method
Which solution is used for insoluble esters in water that are easily hydrolyzed?
Alcoholic solution of NaOH or KOH
Which compound is reacted with excess bromate-bromide solution in the bromination method?
(C6H5-NH2)
Which compound is used to replace the amino group in the acetylation method?
(C6H5-NH2)
How can the % of amino group in a sample be calculated using the given formula V = volume of NaOH, N = conc. of NaOH, W = weight of sample, M.wt = M.wt of NH2?
$\frac{V \times N \times W}{M.wt}$
Test your knowledge on the determination of functional groups and esters in organic compounds, as well as the saponification method used for ester determination in essential oils.
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