Extended Essays 2021

Methyl Salicylate Quantification:

The raw data shown in Appendix #11 & 12

Table #4: Percentage concentration of synthesised methyl salicylate from calibration

curve:

Duration of reflux ( ℎ ) Percentage concentration of synthesized methyl salicylate (%) 1.00 21 2.00 23 3.00 27 4.00 30 5.00 33

Table #5: yield of synthesised methyl salicylate: Duration of reflux ( ℎ )

Average mass of the methyl Salicylate solutions ( ±0.0001 g)

Yield of the synthesized methyl salicylate (% mass)

11.2115 11.6969 11.6681 12.5660 12.4630

37 38 38 41 41

1.00 2.00 3.00 4.00 5.00

*Theoretical yield calculated in Appendix #13 = 30.4299g

Example Calculation #2: Percentage yield of synthesised methyl salicylate (%)

11.2115 30.4299

=

× 100 = 36.8437 ≈ 37%

Figure #5:

Percentage Concentration of Synthesised Methyl Salicylate as the Duration of Reflux is Increased

36

34

y = 3.1x + 17.5 R² = 0.9928

22 Concentration of Methyl Salicylate ( %) 24 26 28 30 32

20

18

0

1

2

3

4

5

6

7

Duration of Reflux (hours )

11