Synonyms for Tartness (same or very similar meaning)
WordNet sense 1 (the taste experience when vinegar or lemon juice is taken into the mouth):
sour, sournessWordNet sense 2 (a sharp sour taste):
acerbityWordNet sense 3 (a rough and bitter manner):
acrimony, bitterness, jaundice, thorninessFrom the ODE community, based on WordNetadd/edit