Add into Burette

Shake it to clean the Burette

After that, turn out the NaOH from down of Burette Rinse it until 3 times

Add into Volumetric Flask

Add aquades until reach the limit indicator

Close the Volumetric Flask, then shake it

Determining the Percentage Volume of Acetic Acid in Vinegar

A. PurposeTo determine the percentage of acetic acid in Vinegar

B. Basic TheoryTitration of acetic acid solution and sodium hydroxide solution is an example of the titration of a weak acid and a strong base. The calculation of pH of the titration of a weak acid with a strong base can be separated into four different types, which corresponds to four of the titration curve.

C. Material & Equipment Burette Erlenmeyer flask Gratuated cylinder Pipets Burette clamp Buncher funnel

Vinegar NaOH 0.1 M Phenophlatein Indicator Volumetric Flask Aquades

D. ProcedureStep 1 : Dilution

Step 2 : Cleaning

A little of NaOH 0.1 M solution

The Burette is clean, and ready to use

5 mL of Vinegar

Result : Vinegar Solution

Add into Burette until the indicator at 0 mL

Add 3 drops of PP

Place it under the Burette that fills with NaOH Solution

Titrate with NaOH solution

Quickly stop titrate when the color of Vinegar change into pale pink

Take final reading to the volume of NaOH that needed to titrate Vinegar solution with looking at Burrete indicator

Step 3 : Titrating

E. Experimental Data

F. Analyze Data

1. Acetic Acid (M1 . V1) = (M2 . V2) NaOH

M . 10 = 0.1 . 11.57

M of Acetic Acid = 0.1 . 0.1 . 11.57

= 0.1157 M

2. % = M .Mm10 . ρ . df

= 0.1157 .7 0

10 .1 . 10

NaOH 0.1 M

Let it, and now, prepare the Vinegar solution

10 mL Vinegar Solution

Result

Titration Volume of NaOH added1 13.2 mL2 10.5 mL3 11.5 mL4 11.1 mL

Average 11.57 mL

= 8.099 %

G. Conclusion

To determine the percentage volume of Acetic Acid in Vinegar, we use formula :

% = M .Mm10 . ρ . df

H. Reference-