practicals

Question 1

role of conc sulphuric acid in production of ester

Answer 1

catalyst

Question 2

safety when heating a practical

Answer 2

water bath rather than bunsen burner
less vigorous

Question 3

condenser - which end is water in at?

Answer 3

bottom
maintain cooling - make sure it is cool enough

Question 4

gas produced when sodium carbonate added to carboxylic acid

Answer 4

CO2

Question 5

use of adding sodium carbonate in ester practical

Answer 5

neutralise acid

Question 6

reason why separating funnel works

Answer 6

they have different densities
one may be non-water soluble

Question 7

anhydrous calcium chloride (ester practical use)

Answer 7

drying agent
remove traces of water

Question 8

use of small glass beads

Answer 8

anti-bumping granules

Question 9

reason why percentage yield is not 100%

Answer 9

reversible reaction
not fully on one side of equilibrium

Question 10

ester with a metal name

Answer 10

carboxylate salt

Question 11

why do amino acids travel different distances in TLC

Answer 11

different polarities
different attractions/retention to stationary phase
different solubility in solvent

Question 12

safety precautions in TLC

Answer 12

gloves to prevent contact with toxic plate