Ph and TA difference

TA is the percent by weight of acid in solution, expressed in terms of tartaric, i.e. grams tartaric / ml solution * 100, or grams tartaric per 100 ml. solution.

pH is related to an acid's strength in wine, while the TA relates to the amount of acid. Although interrelated, they are not the same thing. A solution containing a specific quantity of a relatively weaker acid such as malic acid will have a different (higher) pH than a solution containing the same quantity of a stronger acid such as tartaric.

The pH of a solution is defined as the -log of the hydrogen ion. Given the measurement is logarithmic in nature, a solution with a pH of 3.0 is ten times stronger than a pH of 4.0. The total quantity of hydrogen and hydroxyl ions is constant in a solution, as one increases the other decreases. Acidic solutions contain more hydrogen ions than hydroxyl ions; basic solutions contain more hydroxyl ions than hydrogen ions. A pH of 7 is neutral (neither acid or base) as the concentration of hydrogen ions and hydroxyl ions are equal at that point.

HTH

Great. Thanks! Jack explained the two quite well and I can now move on to my next question for which I will create a new topic.

-Danno