How much acid does grape juice have?

Grape juice has a pH level between 3.2 and 4.0, which means it is acidic. The acidity in grape juice comes from the presence of malic acid, tartaric acid, and other organic acids. These acids give grape juice its sour taste and help to preserve it. The amount of acidity in grape juice can vary depending on the type of grapes used, the climate in which they are grown, and the winemaking process.