Yes, you can use the SC-300 (or -200) to determine total acidity in vinegar. Assuming it is a typical acid strength of 5%, that would be 50 mL/L as acetic acid, which is the same as 50 g/liter (density of acetic acid liquid is 1.0). So, 50 g/L divided by 60 g/mol acetic acid means it would be about 0.83 mol/L acetic acid. In 1.0 mL then, there would be 0.83 mmol of acetic acid. This would take 0.83/0.133 or about 6.2 mL of the TA Titrant (which is 0.133 mmol/mL) to titrate completely.
Here’s the procedure:
1. Measure out as precisely as possible 1.00 mL of your vinegar into a small beaker or other titration vessel.
2. Add about 20 mL of distilled or deionized water.
3. Attach and Insert the pH electrode (it’s a good idea to calibrate it ahead of time). Begin gentle stirring or swirling
4. Put your SC-300 in TA mode and titrate with TA Titrant per the usual method to pH 8.2; record the mL of TA Titrant used as ‘V’.
5. Calculate:
% acetic acid by volume = 0.798 * V
or, if you use some other NaOH Titrant and/or a different volume of sample:
% acetic acid by volume = 100% * V * N * 60 / (S * 1000)
where N is the NaOH Titrant strength (0.133 in our case), and S is the sample volume in mL (1.00 in our case).