ESTERFICATION Flashcards
True or false? The purpose of refluxing this reaction is to maintain a constant temperature.
True
FALSE
false
True/False Le Chatelier’s principle says that equilibrium will respond to external changes in order to re-establish equilibrium. In this experiment you will perturb an equilibrium, push it to the side of the products by using a high concentration of one of the reactants.
True
False
True
Why should the “water IN” connection be at the bottom of the condenser and not the top? Select all that apply.
Connecting at the bottom ensures that the condenser is filled with water.
The condenser is colder at the bottom.
It warms up the condenser better
Connecting at the bottom ensures that the condenser is filled with water.
The condenser is colder at the bottom.
Why can’t you isolate the product in your reaction by crystallization?
The product is a solid
The product is a liquid
The product is a liquid
What method will you use to isolate your product?
recrystallization
extraction
distillation
extraction
You will need to extract the acid catalyst and any unreacted acid reactant using a base solution. What base will you use?
sodium hydroxide
sodium chloride
sodium sulfate
sodium bicarbonate
sodium bicarbonate
After extracting you will need to dry the reaction mixture. What will you use to dry it with?
sodium hydroxide
sodium chloride
sodium sulfate
sodium bicarbonate
sodium sulfate
What is the role of the Amberlyst-15 catalyst?
To speed up the reaction
To lower the activation energy barrier
To enable the reactants to overcome the activation energy barrier
All of the above!
All of the above!
What is the purpose of refluxing the reaction?
To heat the reaction mixture
To provide thermal energy to the reactants
To enable the reactants to overcome the activation energy barrier
All of the above!
All of the above!
The sodium sulfate is added at the end of the procedure as a drying agent. Which is/are the most important intermolecular forces between the sodium sulfate and the water?
There are two correct answers. Both need to be selected for credit.
Dipole-Dipole Forces
Ion-Dipole Forces
Hydrogen bonding
Induced Dipole (London Dispersion Forces)
Hydrophobic interactions
Ion-Dipole Forces
Hydrogen bonding
Extraction of unreacted acetic acid into the water layer is aided by converting it from its neutral form into an ionic form because ions are more soluble in water. What is the charge on the acetic acid in its ionic form?
positive
Negative
Negative
During extraction, the organic layer is on the top and the aqueous layer is at the bottom. Which is more dense, the organic layer or the aqueous layer?
Organic layer
Aqueous layer
Aqueous layer
Why is it better to use the weaker base here?
The ester will react with the stronger base
Using NaHCO3 helps extraction by liberating CO2
Using NaHCO3 makes the reaction involved in extraction irreversible
All of the above!
All of the above!
Why does the water go into the bottom of a water condenser and not the top?
A. So that the water fills the condenser
B. So that the cold part is at the bottom
Both A and B are correct!
Actually, water should go in to the top, not the bottom
Both A and B are correct!
For the biodiesel lab experiment
Choose the correct reagents for the reaction
Choose the correct catalyst for the reaction
- canola oil/methanol
- 2/ potassium carbonate
