Chemical structure, source.

1. Chemical structure: Fruit acid is an organic acid, an organic compound composed of carboxyl and hydroxyl groups, such as malic acid and citric acid. Hydrochloric acid is an inorganic acid with the chemical formula HCl.

2. Source: Fruit acids are usually found in natural foods, such as fruits, vegetables and wine. Hydrochloric acid is an inorganic acid usually prepared by industrial methods.