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12
2025
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11
Determination of Total Acidity of Vinegar by Fully Automated Potentiometric Titration
1. Introduction
Vinegar is an important condiment, mostly made from fermented rice or sorghum. Its main components are acetic acid and higher alcohols. There are many types of vinegar, and the amount of acetic acid varies depending on the fermentation process. The quality of vinegar is related to people's health, and total acidity is one of the important indicators for measuring the quality of vinegar. The national standard requires it to be no less than 3.5g/100mL. This article uses the Shanghai Jiahang JH-T6 fully automatic potentiometric titrator for testing. The method is simple, quick, accurate, and reliable, meeting the precision requirements of the national standard.
2. Instruments and Equipment
2.1 Instruments
JH-T6 fully automatic potentiometric titrator, 10mL burette, Hamilton pH composite electrode
2.2 Reagents
NaOH solution (0.05mol/L), ultrapure water
3. Experimental Methods
3.1 Experimental Procedure
Accurately pipette 10mL of the sample into a 100mL volumetric flask, add water to the mark, and mix well. Then accurately pipette 20mL of the diluent into a titration cup, add 50mL of water, and titrate with NaOH solution to pH=8.2. Perform a blank test simultaneously.
3.2 Parameter Settings
4. Results and Discussion
4.1 Experimental Results
Calculation formula:
Where:
X -- Total acid content in the sample, g/100mL;
V1 -- Volume of NaOH solution consumed during sample titration, mL;
V0 -- Volume of NaOH solution consumed during blank titration, mL;
c -- Concentration of NaOH solution, mol/L;
0.060 -- Mass of acetic acid equivalent to 1 mL of NaOH solution (1.000 mol/L), g;
V -- Sample volume, mL.
4.2 Spectrum
4.3 Conclusion
The difference between the two parallel samples in this experiment meets the precision requirements of the national standard.
Precautions
In the blank test parameters, the slow drop volume is 0.01 mL, the fast drop volume is 0.03 mL, and other values are referenced from the sample parameter chart. Since this experiment is an endpoint titration, the electrodes must be calibrated using the three-point calibration method before the experiment begins.
Keyword:
Automated Potentiometric Titration
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