What is a characteristic that indicates a tomato is an acid?

A tasty bite of tomato contains more than 10 different types of acids, but two account for a large percentage of the total: citric acid and malic acid. Tomatoes also contain another essential acid, ascorbic acid, which is better known by its common name: vitamin C. All three acids have roles in protecting your health and sustaining energy.

Spontaneity tell us the direction of the reaction, but not how fast it goes. gibbs free energy brings together enthalpy, entropy and temperature in one easy formula. g = h - ts. and, finally the sign of delta g is always negative for a spontaneous reaction.