Isobutanol + Acetic acid ---> Isobutyl acetate + water Show calculation for % yi
ID: 1020018 • Letter: I
Question
Isobutanol + Acetic acid ---> Isobutyl acetate + water
Show calculation for % yield.
result: percentage yield = actual yield / theoretical yield = 5.45g / 7.8408g * 100 = 69.51%
My real quetions are below. I don't know how to determine purity of product so I can't make comment about it.
Comment on your collected data in regards to the success of the reaction andche to the purity of your product.
Comment of presence or absence of impurities—what is your most likely impurities? If you received low yields speculate on what could have caused this.
Analyze the NMR with the appropriate interpretation. Identify the main absorptions in the IR
Explanation / Answer
1. The purity of a compound may be determined from its melting point and the presence of impurities can also be dertermined from the IR spectrum based on the presence of peaks corresponding to reactant.
For eg., In the given reaction, Alcohol+Carboxylic acid----> Ester
Reactants are alcohol and carboxylic acid both contain -OH group and shows a broad peak in the range of 3600-3400cm^-1, which disapperas in the product ester. Since the given IR spectrum do not shows O-H stretch at 3600-3400cm^-1 range, hence it is concluded that product has formed and the obtained product is pure.
2. Isobutanol + Acetic acid ---> Isobutyl acetate + water
It is an esterification reaction and it is reversible, it makes the yield of the reaction low. The low yield may be also due to low nuclepohilicity of alcohol.
3. IR spectrum shows a sp3 C-H asymmetric stretch at 2964 and the corresponding bending vibrations are found at 1380cm-1.
A strong peak at 1722 is due to ester carbonyl group and a peak at 1035 is due to C-O stretch.
4. H-NMR-A doublet at 0.95ppm is due to six H's, a multiplet at 1.97ppm is due to 1H, a singlet at 2.21ppm is due to methyl carbon adjacent to carbonyl carbon and a doublet at 3.86ppm at is due to 2H's adjacent to oxygen.
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