c6.1.5 making ethanol Flashcards
1
Q
what are the two ways ethanol can be made
A
Fermentation and hydration of ethene
2
Q
fermentation equation
A
C6H12O6 (aq) –> 2CO2 (g) + 2C2H5OH (aq)
3
Q
Temperature for fermentation
A
usually 35 degrees
enzymes stop working at 50 degrees
4
Q
hydration of ethene formula
A
C2H4 (g) + H2O (l) <=> C2H5OH (l)
change in energy= -45 kj/mol
5
Q
Temperature for hydration of ethene
A
300 degrees
6
Q
Pressure for hydration of ethene
A
60 atm
7
Q
Is a catalyst needed for hydration of ethene
A
yes- phosphoric acid catalyst
8
Q
method for fermentation
A
- mix glucose solution and yeast in a conical flask
- attach a bung with a straw
- put the other end of the straw into a test tube with limewater
- limewater should turn cloudy if CO2 is present