Question: how acidic is apple juice?
Answer: Malic acid, the major acid of apple juice, was found in one variety at a concentration of 1738.2 mg/100 ml. Many of the varietal juices tended to be high acid types as demonstrated by the malic acid mean of 847.7 mg/100 ml and the overall varietal range of 1544.9 mg/100 ml at 11.5 Brix .