OtherPapers.com - Other Term Papers and Free Essays
Search

Determination of Acetic Acid from Commercial Vinegar

Essay by   •  February 17, 2018  •  Lab Report  •  1,588 Words (7 Pages)  •  191 Views

Essay Preview: Determination of Acetic Acid from Commercial Vinegar

Report this essay
Page 1 of 7

Name: Jeb Reece Grabato                                                Date Performed: 03/02/2017

Robert John Vidal                                                        Group No.: 3

Experiment No. 3

Determination of Acetic Acid Content in Vinegar

  1. Background

Titration is a method of chemical analysis used to determine the concentration of a substance of known stoichiometric composition. The volume or mass of titrant (a standard reagent) that is needed to react completely with the analyte (the solution being analysed) is determined. The determined value is then used to calculate the amount of analyte (Skoog et al, 2014).

The objective of this experiment is to use volumetric titrations to determine the % w/v concentration of acetic acid from commercial vinegar. The titrant used is ~0.1 M NaOH, and the indicator used is phenolphthalein.

  1. Results

Table 1. Measurement of Relative Strengths of Acid and Base

Trials

1

2

3

Final Reading HCl (mL)

26.00

28.50

41.95

Initial Reading HCl (mL)

1.00

3.35

16.92

Back-titrated HCl (mL)

0.47

0.18

Volume HCl used (mL)

25.47

25.33

25.03

Final Reading NaOH (mL)

25.15

35.30

26.78

Initial Reading NaOH (mL)

2.62

13.02

4.20

Volume NaOH used (mL)

22.53

22.28

22.58

Acid to Base Ratio

1.13049

1.13689

1.10850

Average acid/base ratio

1.12529

Standard Deviation

0.01489

RSD (ppt)

13.23

Base to Acid Ratio

0.884570

0.879589

0.902117

Average base/acid ratio

0.888759

Standard deviation

0.0118337

RSD (ppt)

13.31

Primary standard used: KHP

Formula mass of primary standard = 204.22 g/mol

% Purity of primary standard = 99.98%

Table 2. Standardization of NaOH

Trials

1

2

3

Wt. of std. KHP (g)

0.7005

0.7001

0.7047

Corrected wt. KHP (g)

0.7004

0.7000

0.7046

Final Reading NaOH (mL)

38.75

41.52

42.55

Initial Reading NaOH (mL)

4.25

7.32

7.95

Volume NaOH used (mL)

34.50

34.20

34.60

Final Reading HCl (mL)

42.55

42.61

Initial Reading HCl (mL)

42.50

42.55

Volume HCl used (mL)

0.05

0.06

Corrected Vol. of NaOH (mL)

34.46

34.20

34.55

Molarity of NaOH

0.09952

0.1002

0.09986

Ave. Molarity of NaOH

0.09986

Standard Deviation

3.400 x 10-4

RSD (ppt)

3.405

Molarity of HCl

0.08844

0.08904

0.08874

Ave. Molarity of HCl

0.08874

RSD (ppt)

3.3807

Table 3. Determining the Acetic Acid Content of Vinegar

Trials

1

2

3

Vol. of vinegar used (mL)

25.00

25.00

25.00

Vol. of aliquot used (mL)

50.00

50.00

50.00

Final Reading NaOH (mL)

39.50

36.10

38.50

Initial Reading NaOH (mL)

2.40

0.80

3.20

Volume NaOH used (mL)

37.10

35.30

35.30

Final Reading HCl (mL)

45.50

45.60

Initial Reading HCl (mL)

42.61

45.50

Volume HCl used (mL)

2.89

0.10

Corrected vol. NaOH (mL)

34.53

35.30

35.21

% w/v acetic acid

4.142 %

4.234 %

4.223 %

Ave. % w/v acetic acid

4.199 %

Standard Deviation

0.05046

RSD (ppt)

12.02

...

...

Download as:   txt (9.6 Kb)   pdf (196 Kb)   docx (578.6 Kb)  
Continue for 6 more pages »
Only available on OtherPapers.com
Citation Generator

(2018, 02). Determination of Acetic Acid from Commercial Vinegar. OtherPapers.com. Retrieved 02, 2018, from https://www.otherpapers.com/essay/Determination-of-Acetic-Acid-from-Commercial-Vinegar/63409.html

"Determination of Acetic Acid from Commercial Vinegar" OtherPapers.com. 02 2018. 2018. 02 2018 <https://www.otherpapers.com/essay/Determination-of-Acetic-Acid-from-Commercial-Vinegar/63409.html>.

"Determination of Acetic Acid from Commercial Vinegar." OtherPapers.com. OtherPapers.com, 02 2018. Web. 02 2018. <https://www.otherpapers.com/essay/Determination-of-Acetic-Acid-from-Commercial-Vinegar/63409.html>.

"Determination of Acetic Acid from Commercial Vinegar." OtherPapers.com. 02, 2018. Accessed 02, 2018. https://www.otherpapers.com/essay/Determination-of-Acetic-Acid-from-Commercial-Vinegar/63409.html.