Alternative To Practical Flashcards
0
Q
Name 2 WEAK acids.
A
Ethanoic acid (4), Carbon dioxide (aq) (6)
1
Q
Name 3 STRONG acids.
A
Nitric acid (1), Hydrochloric acid (1), Sulphuric acid (1).
2
Q
Name 2 WEAK alkalis.
A
Ammonia (aq) (11), Sodium hydrogen carbonate (aq) (8).
3
Q
Name 2 STRONG alkalis.
A
Lithium hydroxide (13), Sodium hydroxide (13).
4
Q
Explain the 7 steps to thermometric titrations (Usually used to work out an unknown concentration)
A
- Allow reacting solutions to stand for a while, so both are at the same (room) temperature before reaction.
- Use a pipette to measure out an accurate amount of alkali at a known concentration into a polystyrene cup.
- Measure the temperature of the alkali.
- Add small, known, volumes of acid from a burette (e.g. 2.00cm3).
- Mix and measure the maximum temperature reached.
- Keep on taking temperature measurements while the temperature declines.
- Plot a graph of the results and use extrapolation of two straight lines. The point where the lines cross is the neutralisation point.