Extended Essays 2021

Data Collection & Analysis Calibration Curve:

The raw data shown in Appendix #10

Table #3: Average Absorbance for the percentage concentrations (10-50%):

Average absorbance ( ± . )

Concentration of methyl salicylate (%)

10

1.2103

20 30

1.3625 1.6256

40

2.0822

50

2.4376

Figure #4:

Methyl Salicylate & Ferric Chloride Calibration Curve

2.8

2.6

2.4

2.2

y = 0.0317x + 0.7914 R² = 0.969

1 Absorbance (±0.0001Au ) 1.2 1.4 1.6 1.8 2

0.8

0.6

0

10

20

30

40

50

60

Concentration of Methyl Salicylate (%)

Example Calculation #1: the concentration of synthesised methyl salicylate (%)

: ℎ − (1.4704) : ℎ : = 0.0317 + 0.7914 1.4704 = 0.0317 + 0.7914

= 1.4704 − 0.7914 0.0317 = 21.4196 ≈ 21%