We currently do some pH adjustments of jams (target pH of 3.2) using citric acid, however, when there is a large difference between the starting pH and the target pH this can be quite a time consuming process (add to vessel, mix, take sample, repeat).
It's been a long time since I've done chemistry, but I believe that because the pKa of the citric acid is close to the target pH and the jams are a complex mix of buffering agents that it isn't easy to come up with a simple formula for the amount to add (in fact, I observe, even at a similar starting pH, the amount of citric acid required varies a lot).
My idea was to titrate citric acid into a sample of jam that has been diluted with distilled water for easier mixing:
- Jam @ 50% dilution
- Citric Acid dissolved at a ratio of 1:9 in distilled water
My thought is that if I keep taking samples and titrating the citric acid with the diluted Jam that I will get a nice correlation between the titration amount and the amount of citric acid required to add to the batch.
My question is:
- Will this produce a nice correlation?
- Is it possible to do this theoretically?