The Phosphoric Acid Salt of Caffeine Has the Structure

The phosphoric acid salt of caffeine has the structure This molecule behaves as an acid in that it can donate a hydrogen ion, created from the hydrogen atom bonded to the positively charged nitrogen atom. What salt is formed when 1 mole of this salt reacts with 1 mole of sodium hydroxide, NaOH, a strong base?

A) Salts can't react to form salts, rather they only arise from the reaction of an acid and a base.
B) H₃O⁺H₂PO₄^-
C) Na²⁺HPO₄^2-
D) Na⁺H₂PO_4-