acid and base Flashcards
1
Q
indicator disadvantages
A
- inaccurate, subjective
- destructive
1
Q
indicator advantages
A
- cheap
- very accessible
- quick
- convient
2
Q
pH meter advantages
A
- very accurate and precise - can measure down to the 0.01th of pH unit
- non-destructive
3
Q
pH meter disadvantages
A
- inaccessible
- expensive
- high maintenance
4
Q
methyl red
A
4.8 - 6.2
red - yellow
5
Q
bromothymol blue
A
6.0 - 7.6
yellow - blue
6
Q
phenolphthalein
A
8.2 - 10
colourless - pink
7
Q
acid + reactive metal
A
salt + hydrogen gas
8
Q
acid + carbonate
A
salt + carbon dioxide + water
9
Q
primary standard selection
A
- be a water soluble solid
- have high purity
- have an accurately known formula
- be stable in air i.e. it does not lose or gain water or react with oxygen or carbon dioxide in air
- high molar mass - reduces percentage error from weighing solid
10
Q
A
