UNIT 5 - PRACTICAL

Question 1

what are sources of inaccuracy

Answer 1

• temperature
• pH
• colour change is subjective
• resolution

Question 2

how to improve accuracy/precision of temperature

Answer 2

use a thermostatically controlled water bath

Question 3

how to improve accuracy/precision of pH

Answer 3

use a pH buffer

Question 4

how to improve accuracy/precision of colour change

Answer 4

colorimeter

Question 5

how to improve accuracy/precision of resolution

Answer 5

measure to nearest (e.g 0.1cm³)
or
USE CALIPERS TO MEASURE

Question 6

how to carry out control experiment for enzymes

Answer 6

all other variables must be kept the same, but boil and cool enzymes

Question 7

inaccuracy for enzyme prac specifically

Answer 7

there could be unequal volumes of amylase on each filterpaper disk

dip each filter paper into amylase for same length of time