why is absolute ethanol used rather than 95% ethanol in this experiment? Propose
ID: 1042388 • Letter: W
Question
why is absolute ethanol used rather than 95% ethanol in this experiment? Propose a structure for the solid that separates when concentrated sulfuric acid is added to the solution of p-aminobenzoic acid in ethanol. Sodium carbonate is used to adjust the pH to 8 during the work-up of the reaction. What undesired reaction might occur with the product if you made the solution strongly basic with aqueous sodium hydroxide? Why did the product precipitate out with the addition of sodium carbonate? Write out the chemical 1, 2. 3. 4. transformation that occurs. MR spectrum of the product, assign the various resonances to the hydrogens. Do the In the 'H N same for the 13C NMR peaks. Draw resonance structures 5.Explanation / Answer
1. The 95% ethanol means the little amount of water presented in diluted ethanol. It can prevents the ester formation. Absolute alcohol means it contains 1% or less of water.
95% alcohol has about 5% water. The presence of water will leads to the backward reaction. In this the instead of acids becomes ester, the esters becomes acid because of H2 from water.
The absolute ethanol can be choose will lead to forward reaction rather than using any forms of ethanol.
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