I made an account to ask this. I have looked and could not understand any of the formulas I came across. I even looked for calculators, but did not understand how to use them. Milk has a pH of 6.5 to 6.7 (lets use 6.7) And I wish to lower the milk's pH to 4.9 (as an example) How do I calculate the citric acid amount needed to lower the pH for my needs? Thank you for your time and help.