Total Acidity of Mustard Acetic Acid

Weigh into a 250 mL beaker a sample close to but not less than 5.0 g. Record the weight to the third decimal place. Add 125 mL of distilled water and stir magnetically and briskly until the a smooth suspension is obtained (about 5 minutes). Immerse a calibrated (4.00 and 7.00 / H) combination glass electrode in the solution, making sure that, when stirring, the reference compartment frit 

The unit is operated in the GET pH mode, the mode which carries out a titration along drift control hnes. The unit also carries out SET mode (deadstop endpoint) titrations. Both modes can be operated in pH or mV. Karl Fischer titrations can also be carried out. 

For the titration reported here, the titrant was NaOH solution standardized at 

Note that the duplicate results are 2.503% and 2.501% acetic acid. These are typical precisions for modern microprocessor-controlled potentiometric titrators. 

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