HardChemistryHigh School (11–12)Organic Compounds with Functional Groups › Alcohols, Phenols and EthersNumerical
A mixture of 1.00 mol of ethanoic acid and 2.00 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 stops changing. The equilibrium constant is . Use for ethyl ethanoate. Find the amount of ester at equilibrium, the mass of ester and the amount of ethanol left.
Need a reminder? The key ideaShow
Lucas test: tertiary at once, secondary in about five minutes, primary clear at room temperature. Dehydration follows Saytzeff's rule. Esterification is an equilibrium with . Primary alcohols oxidise to aldehydes and acids, secondary alcohols to ketones, and tertiary alcohols are not oxidised.
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.
Given. acid, alcohol, .
Plan. Write the equilibrium expression and solve for , the moles of ester (and of water).
Step 1. The equation. , so , which gives .
Step 2. The root. . The other root, 3.15, is more than the acid available.
Step 3. The mass. .
Step 4. Alcohol left. .
Check. The acid left is . Then , which agrees with .
Answer: , and .
Discussion (0)
Log in to join the discussion.
Loading…