UNIT 5 - PRACTICAL Flashcards
1
Q
what are sources of inaccuracy
A
- temperature
- pH
- colour change is subjective
- resolution
2
Q
how to improve accuracy/precision of temperature
A
use a thermostatically controlled water bath
3
Q
how to improve accuracy/precision of pH
A
use a pH buffer
4
Q
how to improve accuracy/precision of colour change
A
colorimeter
5
Q
how to improve accuracy/precision of resolution
A
measure to nearest (e.g 0.1cm³)
or
USE CALIPERS TO MEASURE
6
Q
how to carry out control experiment for enzymes
A
all other variables must be kept the same, but boil and cool enzymes
7
Q
inaccuracy for enzyme prac specifically
A
there could be unequal volumes of amylase on each filterpaper disk
dip each filter paper into amylase for same length of time
