A mixture of 1.00 mol of ethanoic acid and 3.00 mol of ethanol is heated with a little concentrated…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A mixture of of ethanoic acid and of ethanol is heated with a little concentrated sulphuric acid until it is at balance. The equilibrium constant is . Find the percentage of the acid that has become ester, and the mass of ethyl ethanoate (). Say what would raise the yield without changing .
Need a reminder? The key ideaShow
Fischer esterification is an equilibrium: for 1 mol of acid and mol of alcohol. SOCl gives acid chlorides, LiAlH gives alcohols, Br with red P gives 2-bromo acids (Hell-Volhard-Zelinsky), soda lime removes one carbon, and Kolbe electrolysis doubles the alkyl group. Molar volume of a gas at 273 K and 1 atm: 22.4 L/mol.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. gives .
Step 2. , which is .
Step 3. Mass .
Answer: and .
What would raise the yield? More ethanol, or removing the water as it forms. Neither changes , but each moves the balance towards the ester.
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